UnderCover UC1138S Elite Smooth Tonneau Cover; Smooth Gray Finish; Must Be Painted; Fits select: 2014-2018 GMC SIERRA
UnderCover UC1138S Elite Smooth Tonneau Cover; Smooth Gray Finish; Must Be Painted; Fits select: 2014-2018 GMC SIERRA
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UNDERCOVER

UnderCover UC1138S Elite Smooth Tonneau Cover; Smooth Gray Finish; Must Be Painted; Fits select: 2014-2018 GMC SIERRA

4.6 stars out of 243 reviews
(4.6)|
243 ratings
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Key item features

Tonneau Cover

Elite Smooth Tonneau Cover

Elite Smooth Tonneau Cover; Smooth Gray Finish; Must Be Painted;


FEATURES:
  • Lightweight; ABS; Composite Construction
  • Custom Engineered For A Precise Fit
  • Premium Carpet Lined Underside
  • Full Perimeter Seal
  • Removable LED Light
  • Removes Easily Using Quick Release Hardware

UnderCover Inc, located in Rogersville Missouri, is a manufacturer of ABS composite truck bed covers and truck accessories. In business since 2000, UnderCover has become the number 1 supplier of hard truck bed covers in the USA. UnderCover uses state of the art tooling and manufacturing processes to build precision fit, ultra durable, and extremely strong products. All of the UnderCover products are proudly built in right here in America. On top of the notability of UnderCover, we are part of a larger group called THI. THI is made up of Extang, UnderCover, Truxedo, BedRug and Advantage Truck Accessories. Together we make up the largest group of its kind in the Truck Accessory Segment.



Fits Select:
2014-2018 GMC SIERRA
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Current price is $1,224.18
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Customer ratings & reviews

4.6 out of 5 stars
stars243 ratings243 reviews
How item rating is calculated
  1. 5 stars77% (188)
  2. 4 stars13% (31)
  3. 3 stars4% (9)
  4. 2 stars0% (1)
  5. 1 star6% (14)

Reviews summary

Pros

  • : Has a modern design that enhances the truck's look.
  • : Product's color precisely matches the original vehicle color.
  • : Cover fits snugly around truck bed edges.
  • : Made with high-end components that are durable.
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Showing 1-3 of 243 reviews

Sep 17, 2025
Katherine C.
5 out of 5 stars review

Seller Verified Purchase

Product is beautiful

Everything matched well. No instructions came with the tonneau top at all. We used youtube videos to help. As for customer service of this company: it was horrible. Ordered on July24th. Got it September 4th. We had to drive 115 miles to get it. Everytime I called they gave me different dates. I would not buy from them again. The product itself was good quality is about the only positive I can say.

Review from realtruck.com
Helpful?1BIC7JZ16HS8165428344
Oct 14, 2024
Kenneth A.
5 out of 5 stars review

Seller Verified Purchase

UnderCover tonneau

Purchased the color matched Undercover Elite LX tonneau cover and I'm very pleased. The color match is spot on, and the fit and finish are excellent. The inside is finished with material that matches the BedRug I installed and matched perfectly. Installation is simple and fast, measure for the four brackets, tighten down 8 bolts, snap on the pistons, then adjust the latches for the locks. Very easy and takes around 30 minutes. I think it's a little on the high side for price, but that's how I feel about EVERYTHING today. Even with the price, would I buy it again - yes!! I previously owned another major brand tonneau on my last truck and this UnderCover tonneau blows that brand away.

Review from realtruck.com
Helpful?1BIC7JZ16HS8165428344
Jun 25, 2025
Douglas R.
5 out of 5 stars review

Seller Verified Purchase

Still Waiting To Receive My Item

I ordered the item on 6/9/25 and it still has not shipped so I can't rate it.

Review from realtruck.com
Helpful?1BIC7JZ16HS8165428344