3J's Auto Body · Signal Hill, CA

Tonneau Covers

Protect your cargo. Improve your fuel economy. Upgrade your truck's look. We source and professionally install the top tonneau cover brands — right here in Signal Hill.

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Increased Durability
Premium Look
Superior Protection
Brands We Carry & Install

Every Style.
Every Truck.

Hard fold, soft roll, or retractable — we source and professionally install the top brands right here in Signal Hill.

BAKFlip
Extang
Retrax
TruXedo
UnderCover
Roll N Lock
BAKFlip tonneau cover on Ford F-150
Hard Fold · Aluminum
BAKFlip
Extang tonneau cover on Ford F-150
Hard Fold · Soft Fold
Extang
Retrax retractable tonneau cover
Retractable · Aluminum
Retrax
TruXedo tonneau cover on Ford F-250
Soft Roll-Up · Hard Roll-Up
TruXedo
UnderCover tonneau cover on Ford F-150 Raptor
Hard Fold · One-Piece
UnderCover
Roll N Lock retractable tonneau cover
Retractable · Locking
Roll N Lock
Featured Models

Top Covers. Every Style.

Hard fold, retractable, or roll-up — we carry and professionally install the best models from the best brands.

BakFlip MX4 on Ford F-150
Best Seller
BakFlip
MX4

The world's best-selling hard folding tonneau cover. Aircraft-grade aluminum, matte black finish, re-engineered Gen 3 security.

Hard Fold Made in USA 5-yr Warranty
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BakFlip MX4 EZ-Lift on Ford F-150
New
BakFlip
MX4 EZ-Lift

3X easier to lift with effortless one-handed access, upgraded auto-latch security, and a fully sealed edge-to-edge weather barrier.

Hard Fold Made in USA 3X Easier Lift
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BAK Revolver X4S on 2022 Ram 1500 TRX Blue
New Model
BakFlip
X4S

Diamond plate aluminum texture meets ultimate security. Sleek, low-profile, and built for the truck owner who doesn't compromise.

Diamond Plate Hard Fold Dual-Action Seal
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Extang Solid Fold ALX on Toyota Tacoma
Fan Favorite
Extang
Solid Fold ALX

Premium aluminum hard folding cover with a sleek matte finish, tool-free installation, and maximum bed security.

Hard Fold Tool-Free Install Lifetime Warranty
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Retrax ONE MX on Toyota Tacoma
Premium
Retrax
PRO MX

Polycarbonate retractable cover with a built-in T-slot rail system, smooth one-hand operation, and a low-profile design.

Retractable T-Slot Rail Locking
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UnderCover Armor Flex on Ford F-150 Raptor
Heavy Duty
UnderCover
Armor Flex

Military-grade aluminum panels with a rugged matte finish built to handle the toughest jobs and harshest conditions.

Hard Fold Military Grade WeatherSeal
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Roll N Lock E-Series on Ford F-150
Electric
Roll N Lock
E-Series

One-touch electric retractable cover with automatic locking and full bed access at the press of a button.

Electric Retractable Auto-Lock
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Pairs With Your Tonneau Cover

Elevate Rack System

Transform your truck bed into a full cargo platform. The Elevate Rack System mounts directly to your tonneau cover — adding baskets, carriers, and gear to every build.

Elevate Rack System on truck bed
Elevate Base Truck Rack
Elevate Base Truck Rack
Low-profile platform designed to sit flush with your tonneau cover. The foundation for all Elevate and T-Slot accessories.
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Elevate Truck Rack
Elevate Truck Rack
Telescoping rack for extended reach and elevated clearance. Accepts all Elevate and T-Slot accessories — including the full carrier lineup.
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Baskets & Carriers
Cargo Basket
Cargo Basket
Large deep-cradle basket designed for maximum cargo capacity. Rugged construction handles gear, luggage, and off-road equipment.
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Narrow Cargo Basket
Narrow Cargo Basket
Slim profile creates space for additional accessories alongside it. Perfect for side-by-side cargo organization builds.
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Bike Carrier
Bike Carrier
Transport any bike without frame contact. Secure mounting system protects both your bike and your truck during transit.
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Kayak Carrier
Kayak Carrier
Load kayaks easily and keep watercraft secure during any trip. Padded supports prevent hull damage on long hauls.
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Accessories
Elevate Rack Side Bars
Side Bars
Elevate Rack Channel Guard
Channel Guard
Elevate Rack Load Stops
Load Stops
Elevate Rack Tie-Down Kit
Tie Down Kit
Elevate TS Rails
TS Rails

Ask us about pairing the Elevate Rack System with your tonneau cover installation.

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Why Choose 3J's

Expert Install. Trusted Results.

We don't just sell covers — we install them professionally so they fit right and last.

Professional Installation
Every cover is installed by our experienced technicians. No guesswork, no shortcuts — done right the first time.
Top Brands Only
We carry BakFlip and other trusted brands known for quality, durability, and real warranty support.
Free Quotes
Submit a quote request online or call us. We'll help you pick the right cover for your truck, budget, and use case.
FAQ

Common Questions

The MX4 has a smooth matte black aluminum surface — clean and low-key. The X4S has a diamond plate aluminum texture for a bolder, more rugged look. Both share the same Gen 3 security system and weather sealing. The MX4 is the best seller; the X4S is for drivers who want more visual character.

BakFlip covers typically install in 30 minutes or less. We handle the install at 3J's — you drop off the truck and we take care of it. No drilling or cutting required on most applications.

No — BakFlip covers use a clamp-based mounting system that attaches to the bed rails without drilling. All hardware is included. This also means the cover can be removed if needed.

All BakFlip covers come with a 5-year hassle-free limited warranty from the original purchase date. Coverage requires the cover to be properly maintained and registered with BakFlip.

Yes — the MX4 and X4S fold up in panels and rest flush against the cab, giving you 100% bed access. Your factory tailgate works in any cover position, and the panels stay up on their own while you load or unload.

Ready to Protect Your Truck Bed?

Get a free quote from 3J's Auto Body. We source and professionally install the top tonneau cover brands — Mon–Fri, 8AM–5PM in Signal Hill.

Get a Free Quote