2018 GMC UnderCover Parts
Choose a Model for your 2018 GMC
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Product
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- Triad 15-22 Col/Can 5
- UnderCover Triad 2015-2022 Chevrolet Colorado/GMC Canyon 5' Bed
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 45 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: Yes
- Sits on Truck Rails: No
- Actual Color: Black
-
Features:
- Fashionable matte black panels
- Easy ‘on and off’ functionality
- Integrated perimeter and corner seals
- Dual hinge seals
- The TRIAD by UnderCover is a hard-folding truck bed cover featuring matte black panels for a sleek and innovative addition to your truck bed. Integrated perimeter seals protect your truck bed from the elements, while aluminum panels enhance the security of your truck bed and support up to 600 lbs of evenly distributed weight. The TRIAD has 2 available riding positions in the fully closed and 2/3 open position for convenience to haul and manage most any cargo. The TRIAD is fashioned with easy-to-use tailgate clamps allowing quick access to the truck bed. The TRIAD hard-folding cover comes completely assembled to provide a quick and easy installation and backed by a 3-year warranty.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Canyon | United States | 61.7 |
- Triad 15-22 Col/Can 6
- UnderCover Triad 2015-2021 Chevrolet Colorado/GMC Canyon 6' Bed
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 45 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: Yes
- Sits on Truck Rails: No
- Actual Color: Black
-
Features:
- Integrated perimeter and corner seals
- Dual hinge seals
- Fashionable matte black panels
- Easy ‘on and off’ functionality
- The TRIAD by UnderCover is a hard-folding truck bed cover featuring matte black panels for a sleek and innovative addition to your truck bed. Integrated perimeter seals protect your truck bed from the elements, while aluminum panels enhance the security of your truck bed and support up to 600 lbs of evenly distributed weight. The TRIAD has 2 available riding positions in the fully closed and 2/3 open position for convenience to haul and manage most any cargo. The TRIAD is fashioned with easy-to-use tailgate clamps allowing quick access to the truck bed. The TRIAD hard-folding cover comes completely assembled to provide a quick and easy installation and backed by a 3-year warranty.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Canyon | United States | 74.0 |
- Ultra Flex 14-18 (19 Legacy/Limited) Silv/Sierra 1500/15-19 2500HD/3500HD 6'6
- UnderCover Ultra Flex 2014-2018 (2019 Legacy/Limited) Chevrolet Silverado/GMC Sierra 1500/2015-2019 2500 HD/3500 HD 6' 6" Bed Std/Ext/Crew Cab Matte Black Finish
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 15 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: No
- Sits on Truck Rails: Yes
- Actual Color: Black
-
Features:
- Made Of High Density Aircraft Grade Aluminum
- Premium Powder Coat Texture
- Under Panel Tough Carpet Like Finish
- Saddlebag Storage Made From Heavy Duty Commercial Grade Fabric
- Mounts Out Of The Way
- Allows You To Keep Your Bed Clean And Organized
- Shut Your Tailgate w/Ease
- Never Having To Lift The Last Panel
- A hard folding truck bed cover that comes with overwhelming new features and is topped off with an alluring matte finish. The Ultra Flex is in a category of its own. From the irresistible outward appearance to each component beneath the cover, the Ultra Flex has been carefully crafted to be the ultimate all-purpose truck bed cover. All-new features that accompany the Ultra Flex include a dual action tailgate seal, allowing for easy operation and you to close the tailgate with the cover-up or down. Multiple riding positions allow the user to ride with full access to their bed, and full weather protection is available if the cover is in the fully closed position. Ultra Flex is an easy clamp-on application and can be installed and removed easily with our newly designed L-Rail’s. What’s more, the Ultra Flex is backed by a 5-year warranty, making it the most desirable folding cover on the market.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Sierra 2500 HD | United States | 78.8 |
- Triad 99-18 (19 Leg/Lim) Silv/Sierra 5'9" (99-13 w/out Factory Tailgate Spoiler)
- UnderCover Triad 1999-2018 (2019 Legacy/Limited) Chevrolet Silverado/GMC Sierra 5' 9" Bed (1999-2013 models must remove factory tailgate spoiler and replace with form fitting tailgate cap)
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 45 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: Yes
- Sits on Truck Rails: No
- Actual Color: Black
-
Features:
- Fashionable matte black panels
- Easy ‘on and off’ functionality
- Integrated perimeter and corner seals
- Dual hinge seals
- The TRIAD by UnderCover is a hard-folding truck bed cover featuring matte black panels for a sleek and innovative addition to your truck bed. Integrated perimeter seals protect your truck bed from the elements, while aluminum panels enhance the security of your truck bed and support up to 600 lbs of evenly distributed weight. The TRIAD has 2 available riding positions in the fully closed and 2/3 open position for convenience to haul and manage most any cargo. The TRIAD is fashioned with easy-to-use tailgate clamps allowing quick access to the truck bed. The TRIAD hard-folding cover comes completely assembled to provide a quick and easy installation and backed by a 3-year warranty.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Sierra 1500 | United States | 69.3 |
- Ultra Flex 14-18 (19 Legacy/Limited) Silv/Sierra 1500/15-19 2500HD/3500HD 8
- UnderCover Ultra Flex 2014-2018 (2019 Legacy/Limited) Chevrolet Silverado/GMC Sierra 1500/2015-2019 2500 HD/3500 HD 8' Bed Std/Ext/Crew Cab Matte Black Finish
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 15 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: No
- Sits on Truck Rails: Yes
- Actual Color: Black
-
Features:
- Made Of High Density Aircraft Grade Aluminum
- Premium Powder Coat Texture
- Under Panel Tough Carpet Like Finish
- Saddlebag Storage Made From Heavy Duty Commercial Grade Fabric
- Mounts Out Of The Way
- Allows You To Keep Your Bed Clean And Organized
- Shut Your Tailgate w/Ease
- Never Having To Lift The Last Panel
- A hard folding truck bed cover that comes with overwhelming new features and is topped off with an alluring matte finish. The Ultra Flex is in a category of its own. From the irresistible outward appearance to each component beneath the cover, the Ultra Flex has been carefully crafted to be the ultimate all-purpose truck bed cover. All-new features that accompany the Ultra Flex include a dual action tailgate seal, allowing for easy operation and you to close the tailgate with the cover-up or down. Multiple riding positions allow the user to ride with full access to their bed, and full weather protection is available if the cover is in the fully closed position. Ultra Flex is an easy clamp-on application and can be installed and removed easily with our newly designed L-Rail’s. What’s more, the Ultra Flex is backed by a 5-year warranty, making it the most desirable folding cover on the market.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Sierra 2500 HD | United States | 97.6 |
- Triad 99-18 (19 Leg/Lim) Silv/Sierra 1500/99-19 HD 6'6" (99-13 w/o Fac TG Splr)
- UnderCover Triad 1999-2018 (2019 Legacy/Limited) Chevrolet Silverado/GMC Sierra 1500/1999-2019 2500 HD/3500 HD 6' 6" Bed (1999-2013 models must remove factory tailgate spoiler and replace with form fitting tailgate cap)
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 45 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: Yes
- Sits on Truck Rails: No
- Actual Color: Black
-
Features:
- Fashionable matte black panels
- Easy ‘on and off’ functionality
- Integrated perimeter and corner seals
- Dual hinge seals
- The TRIAD by UnderCover is a hard-folding truck bed cover featuring matte black panels for a sleek and innovative addition to your truck bed. Integrated perimeter seals protect your truck bed from the elements, while aluminum panels enhance the security of your truck bed and support up to 600 lbs of evenly distributed weight. The TRIAD has 2 available riding positions in the fully closed and 2/3 open position for convenience to haul and manage most any cargo. The TRIAD is fashioned with easy-to-use tailgate clamps allowing quick access to the truck bed. The TRIAD hard-folding cover comes completely assembled to provide a quick and easy installation and backed by a 3-year warranty.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Sierra 2500 HD | United States | 78.8 |
- Ultra Flex 15-22 Col/Can 5
- UnderCover Ultra Flex 2015-2022 Chevrolet Colorado/GMC Canyon 5' Bed Crew - Matte Black Finish
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 15 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: No
- Sits on Truck Rails: Yes
- Actual Color: Black
-
Features:
- Made Of High Density Aircraft Grade Aluminum
- Premium Powder Coat Texture
- Under Panel Tough Carpet Like Finish
- Saddlebag Storage Made From Heavy Duty Commercial Grade Fabric
- Mounts Out Of The Way
- Allows You To Keep Your Bed Clean And Organized
- Shut Your Tailgate w/Ease
- Never Having To Lift The Last Panel
- A hard folding truck bed cover that comes with overwhelming new features and is topped off with an alluring matte finish. The Ultra Flex is in a category of its own. From the irresistible outward appearance to each component beneath the cover, the Ultra Flex has been carefully crafted to be the ultimate all-purpose truck bed cover. All-new features that accompany the Ultra Flex include a dual action tailgate seal, allowing for easy operation and you to close the tailgate with the cover-up or down. Multiple riding positions allow the user to ride with full access to their bed, and full weather protection is available if the cover is in the fully closed position. Ultra Flex is an easy clamp-on application and can be installed and removed easily with our newly designed L-Rail’s. What’s more, the Ultra Flex is backed by a 5-year warranty, making it the most desirable folding cover on the market.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Canyon | United States | 61.7 |
- Ultra Flex 15-22 Col/Can 6
- UnderCover Ultra Flex 2015-2022 Chevrolet Colorado/GMC Canyon 6' Bed Std/Ext - Matte Black Finish
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 15 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: No
- Sits on Truck Rails: Yes
- Actual Color: Black
-
Features:
- Made Of High Density Aircraft Grade Aluminum
- Premium Powder Coat Texture
- Under Panel Tough Carpet Like Finish
- Saddlebag Storage Made From Heavy Duty Commercial Grade Fabric
- Mounts Out Of The Way
- Allows You To Keep Your Bed Clean And Organized
- Shut Your Tailgate w/Ease
- Never Having To Lift The Last Panel
- A hard folding truck bed cover that comes with overwhelming new features and is topped off with an alluring matte finish. The Ultra Flex is in a category of its own. From the irresistible outward appearance to each component beneath the cover, the Ultra Flex has been carefully crafted to be the ultimate all-purpose truck bed cover. All-new features that accompany the Ultra Flex include a dual action tailgate seal, allowing for easy operation and you to close the tailgate with the cover-up or down. Multiple riding positions allow the user to ride with full access to their bed, and full weather protection is available if the cover is in the fully closed position. Ultra Flex is an easy clamp-on application and can be installed and removed easily with our newly designed L-Rail’s. What’s more, the Ultra Flex is backed by a 5-year warranty, making it the most desirable folding cover on the market.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Canyon | United States | 74.0 |
- Ultra Flex 14-18 (19 Legacy/Limited) Silv/Sierra 5'9
- UnderCover Ultra Flex 2014-2018 (2019 Legacy/Limited) Chevrolet Silverado/GMC Sierra 5' 9" Bed Crew/Ext Cab Matte Black Finish
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 15 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: No
- Sits on Truck Rails: Yes
- Actual Color: Black
-
Features:
- Made Of High Density Aircraft Grade Aluminum
- Premium Powder Coat Texture
- Under Panel Tough Carpet Like Finish
- Saddlebag Storage Made From Heavy Duty Commercial Grade Fabric
- Mounts Out Of The Way
- Allows You To Keep Your Bed Clean And Organized
- Shut Your Tailgate w/Ease
- Never Having To Lift The Last Panel
- A hard folding truck bed cover that comes with overwhelming new features and is topped off with an alluring matte finish. The Ultra Flex is in a category of its own. From the irresistible outward appearance to each component beneath the cover, the Ultra Flex has been carefully crafted to be the ultimate all-purpose truck bed cover. All-new features that accompany the Ultra Flex include a dual action tailgate seal, allowing for easy operation and you to close the tailgate with the cover-up or down. Multiple riding positions allow the user to ride with full access to their bed, and full weather protection is available if the cover is in the fully closed position. Ultra Flex is an easy clamp-on application and can be installed and removed easily with our newly designed L-Rail’s. What’s more, the Ultra Flex is backed by a 5-year warranty, making it the most desirable folding cover on the market.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Sierra 1500 | United States | 69.3 |
- Flex 14-18 (19 Legacy/Limited) Silv/Sierra 1500/15-19 2500HD/3500HD 8
- UnderCover Flex 2014-2018 (2019 Legacy/Limited) Chevrolet Silverado/GMC Sierra 1500/2015-2019 2500 HD/3500 HD 8' Bed Std/Ext/Crew Cab - Black Textured
- Product Attributes:
- Paintable: No
- Works w/Toolbox: No
- Front Opening: Yes
- Style: Hard Folding Cover
- Install Time: 15 Minutes
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: Yes
- Low Profile: Yes
- Sits on Truck Rails: Yes
- Actual Color: Black
-
Features:
- Ultra Low Profile Design
- Allows For Full Access To Your Bed
- Built In Prop Rods Secure The Cover
- Plastic Buckles And Straps Included
- Rubber Seals And Drain Tubes Channel Water Away
- Easy Clamp-on design and 3 Year Warranty
- Introducing the next generation of folding covers -- the UnderCover Flex folding cover. Flex combines the best of both worlds, the security of a hard locking cover and convenience of a soft roll up cover. Constructed from the best materials available, Flex will withstand the abuse Mother Nature throws at it and keep coming back for more. Low Profile -- Ultra-low profile design rests inside the bed rails allowing for a very sleek look. Full Access -- Built in prop rods secure the cover allowing your truck to be driven with the cover fully open. Easy Removal -- Entire cover can be removed in seconds with no tools needed. Secure Design -- Plastic buckles and straps are included to secure the panels in the partially open position. FRP Composite Panels -- Lighter, stronger and higher dent resistance than aluminum. Weather Resistant -- Rubber seals and drain tubes channel water away from and out of the bed. Easy Clamp-on design. No other folding cover can match the Flex for versatility, security and function. Covered or uncovered, always an option with UnderCover.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2018 - GMC Sierra 2500 HD | United States | 97.6 |
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