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2020-26 Chevy Silverado & GMC Sierra 2500HD/3500HD 6'9" Bed Aluminum Camper Shell with Sliding Windows | Truck Bed Cap & Bed Topper

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2020-26 Chevy Silverado & GMC Sierra 2500HD/3500HD 6'9" Bed Aluminum Camper Shell with Sliding Windows | Truck Bed Cap & Bed Topper

$3,799.00

~~$4,299.00~~

Product variants

$3,799.00

~~$4,299.00~~

Free U.S. Shipping

Continental 48 states

3-Year Warranty

Limited warranty, every cap

Aluminum Construction

Lightweight · weather-tight

DIY Bolt-On

Factory bed rails · no drilling

We Accept

Confirmed Fit

Fits: 2020–2026 (6.9ft)

Precision-engineered bolt-on fit — no modification required

Installation

Bolt-On Install · What You'll Need

Install At A Glance

Install Time

About 1–2 hours

Tools Required

13/17mm sockets, Phillips screwdriver, torque wrench

Skill Level

Intermediate · 2 people required

Drilling

No drilling — uses existing bed holes

What's In The Box

Aluminum Bed Cap Shell
Mounting Clamps & Hardware
Weather Seal
Installation Manual

Aluminum truck cap · bed topper · 2500HD / 3500HD

Chevy Silverado & GMC Sierra HD Aluminum Camper Shell · Sliding Glass Sides

Fits 2020–2026 Chevy Silverado 2500HD/3500HD & GMC Sierra 2500HD/3500HD, 6'9" standard bed. Built for the HD bed — not a 1500 cap stretched to fit. Gullwing doors on both sides, a rooftop-tent-rated roof, and a no-drill install you do in your driveway. Ships free from our California warehouse.

850 lbStatic roof load

450 lbDynamic roof load

6Locking points

No drillClamp-on install

3-yrWarranty

FreeFreight · lower 48

Sliding window open

Sliding glass sides

Open the door. Or just the window.

Each side is a tinted tempered-glass gullwing door with a sliding window built in. Loading gear? Swing the whole door up. Just want air for the dog, or a night in the bed? Slide the window open and leave the door locked. Open both sliders and air moves straight across the bed — for a sleeping platform, a truck-bed camp, or a dog riding in back, it's the difference between a box and a room.

Glass gullwing doors, open

Sliding window, from inside

Three-side access

Full gullwing access

Everything within reach.

Two full-length gullwing doors plus the rear door open the bed from three sides. Gas struts hold each door up on their own, so the cooler or toolbox pushed against the cab is an arm's reach from the curb. Nobody crawls into the bed.

123456

6 locking points

Six-lock security

Lock down the whole bed.

Six locking points cover both side doors and the rear door. Close it up and your tools, recovery gear, and camping equipment sit behind locked aluminum and tempered glass — not a snap-on cover.

T-slot rails

Crossbars

Rack-ready roof, both sides

Rooftop tent

Rooftop tent + awning

Full-length T-slot roof · 450 lb dynamic / 850 lb static

Build above the bed.

Two T-slot rails run the length of the roof. Crossbars, a rack, a rooftop tent, an awning, solar, a bike or kayak carrier — anything with T-slot hardware bolts on, slides where you need it, and comes off clean. Rated 450 lb driving and 850 lb parked: a two-person tent, the people in it, and the gear on the rack.

Door storage · interior expansion points

Doors and walls, ready for your build.

The inside of each gullwing door is a flat, rigid aluminum panel — mount a MOLLE board, a tool rack, or a camp-kitchen shelf and it swings up and out with the door, right where you're standing. Inside, rivet mounting points are already in the roof and both side walls: lights, storage panels, shelves, bolt on without drilling through the shell.

Door panels: tools and recovery gear on one side, camp kitchen on the other
Roof and side-wall points: interior lights, MOLLE and storage panels, shelving

MOLLE panel inside the door

Door panel, rivet-mounted

Snow

Rain

Snow — rooftop tent on

Road tested. Canada tested.

Built for years outside.

Every design gets road tested — vibration and wind load at highway speed — then goes through a Canadian season of deep cold, high humidity, and freeze–thaw swings, to see what the seals, doors, frame, and fasteners do. And because the shell is aluminum, not steel, there's no red rust waiting under the paint. Rain, snow, road salt, coastal air: that's what it was built for.

Glass doors up — gas struts

Crossbars on the T-slot — no drilling

Sealed by design

Built for DIY · no drilling

Easy to build. Sealed by design.

One bolt size runs the whole cap — M8 at every joint, one socket in your hand. The critical seams arrive with 3M sealing tape already on the panel: line it up, torque it down, and the joint is fastened and sealed in the same step. Then it clamps to the bed rails. No holes in your truck, and it comes off the same way it went on.

Two people, a socket set, and your driveway
Modular by design: doors, panels, glass, and hardware are individual parts — damage one, replace one, not the cap

Lakeside camp, sliding glass sides

Made for the campsite

Wake up to the view.

Sliders open for the breeze, glass for the morning light, a tent on the roof for the night. It's a camper shell that actually feels like camping.

Specs

Fits	2020–2026 Chevy Silverado 2500HD/3500HD & GMC Sierra 2500HD/3500HD, 6'9" standard bed (82.2" at floor) · all trims
Does not fit	2015–2019 Silverado/Sierra HD (6'6" bed) · 8 ft long bed · 1500 models
Shell	Aluminum panels and frame, matte black powder coat
Side doors	Tinted tempered glass, gullwing, with sliding window, gas struts
Rear door	Tinted tempered glass, gas struts
Locks	6 locking points — both side doors and the rear door
Roof	2 full-length T-slot rails · 850 lb static / 450 lb dynamic
Hardware	M8 throughout · pre-applied 3M seam tape · bed-rail clamps, no drilling
Interior	Rivet mounting points in roof and side walls · door-mount panel ready
Shipping	Two crates — cap body and roof — strapped to a pallet and delivered by LTL freight truck. Free to the lower 48 from California.
Warranty	3-year limited warranty

— WHO IS TKMAUTO

Aluminum bed caps, built for American pickup trucks.

TKMAUTO focuses on one thing: lightweight aluminum accessories to bling out your truck, old or new, however you want it. Every product ships from our California warehouse, directly to your driveway anywhere in the continental US.

If you have any questions before buying - about fitment, quality, installation - email us, and we'll answer.

Email — info@tkmauto.com

California, USA

Every order ships from our CA warehouse via U.S. freight carriers.

Free U.S. Shipping

Continental 48 states. AK, HI, and U.S. territories on quote.

Aluminum Construction

Lightweight, weather-tight panels. DIY bolt-on install.

6 Truck Lines Supported

Ford · Toyota · GMC · Chevrolet · RAM · Jeep — year-specific fitment.

Complete Your Build

Built to Work Together

Cap, cross bar, rack platform — engineered as one system. Add all three for a complete overland build.

Truck Bed Cap Cross Bar — Aluminum, T-Slot Compatible, Universal Fit

$259.98 $299.98

View product

Truck Cap Roof Rack — Universal Aluminum Topper Rack (Fits A.R.E., LEER, SnugTop, TKMAUTO)

$459.00 $540.00

View product

Full-Size Truck Bed Cap Interior Storage Shelf System

$359.79 $399.98

Left Side (Driver Side) — need both? See product page

View product

Total selected: $0.00

Questions

Frequently Asked

How long does installation take?

Most customers complete the install in about 1–2 hours with two people. No drilling is required — the cap secures to your existing bed rail holes with the included mounting clamps. An install guide is in the box.

Does it come with side windows, or is it solid?

We build both versions on the same 6061-T6 aluminum shell — same load rating, same bolt-on install. The difference is only the side panels:

Windows — tempered sliding glass on the driver and passenger sides. Better for overlanding, camping, pets, or any time you want airflow and outward visibility.
Solid — fully enclosed aluminum panels. Better for job-site tool security or gear you want out of sight and keyed-locked.

Will it fit my truck?

This cap is cut for the specific year, make, model, and bed length listed in the fitment box at the top of the page. If your truck matches that spec, the cap is engineered to bolt right on. Short-bed and long-bed versions are not interchangeable.

Will the aluminum rust or the powder coat fade?

The shell is 6061-T6 aluminum — corrosion resistance is inherent to the material, so the structure won't rust. The exterior is finished in powder-coated black for UV protection. Even if the powder-coat gets scuffed at a job site, the aluminum underneath stays sound. If you ever have a structural concern, contact us at info@tkmauto.com and we'll work with you directly.

How does shipping work?

Free freight shipping in the continental US, from our California warehouse via LTL carrier. Delivery requires a signature; the carrier will schedule a window once it reaches your local terminal. A phone number is required at checkout so the freight carrier can reach you to schedule delivery.

Built with 6061-T6 aluminum shell and stainless steel hardware. If you ever have a structural concern with your cap, contact us at info@tkmauto.com and our California team will work with you directly.

Free LTL freight to the lower 48.

Most bed caps ship in about a week, select models 2–3 weeks — first ordered, first shipped.

Free LTL freight to the lower 48.

Most bed caps ship in about a week, select models 2–3 weeks — first ordered, first shipped.

Free LTL freight to the lower 48.

Most bed caps ship in about a week, select models 2–3 weeks — first ordered, first shipped.

Free LTL freight to the lower 48.

Most bed caps ship in about a week, select models 2–3 weeks — first ordered, first shipped.

Free LTL freight to the lower 48.

Most bed caps ship in about a week, select models 2–3 weeks — first ordered, first shipped.

Free LTL freight to the lower 48.

Most bed caps ship in about a week, select models 2–3 weeks — first ordered, first shipped.

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2020-26 Chevy Silverado & GMC Sierra 2500HD/3500HD 6'9" Bed Aluminum Camper Shell with Sliding Windows | Truck Bed Cap & Bed Topper

Bolt-On Install · What You'll Need

Install At A Glance

What's In The Box

Chevy Silverado & GMC Sierra HD Aluminum Camper Shell · Sliding Glass Sides

Open the door. Or just the window.

Everything within reach.

Lock down the whole bed.

Build above the bed.

Doors and walls, ready for your build.

Built for years outside.

Easy to build. Sealed by design.

Wake up to the view.

Specs

Aluminum bed caps, built for American pickup trucks.

Customer Reviews

Built to Work Together

Truck Bed Cap Cross Bar — Aluminum, T-Slot Compatible, Universal Fit

Truck Cap Roof Rack — Universal Aluminum Topper Rack (Fits A.R.E., LEER, SnugTop, TKMAUTO)

Full-Size Truck Bed Cap Interior Storage Shelf System

Frequently Asked

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