Will this fit a 2021 sierra 2500 at4 hd?

It fits my 2020 same truck. One thing to verify is bed length when you buy it. Dealers told me the length but when I received it it was to short. Measure for yourself before ordering. I bought mine off Amazon. Installed in 15 minutes. No drilling. Easy to remove. Really easy to fold back. Mine is the 4 fold. Worth every penny. Nice to have stuff protected but can have full use of my bed in less than 5 minutes.

Can this be used with a gooseneck trailer in folded position i.e. not flipped all the way up?

It can on my truck, a 2020 GMC 3500 regular bed. That's why I bought this one. I can tow my 5th wheel with the cover in the folded position, not flipped up.

Will this fit a 2023 Silverrado 2500HD with the 6'10" bed?

Yes, the BAK MX$ #448133 fits the 2023 Silverado 2500HD with 6'10" bed.

will this work with gmc multi pro tailgate

Yes, this cover is designed to work with that truck feature.

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RealTruckBAK BAKFlip MX4 Hard Folding Truck Bed Tonneau Cover | 448133 | Fits 2020-2025 Chevy/GMC Silverado/Sierra 2500/3500 6' 10" Bed (82.2")

RealTruckBAK BAKFlip MX4 Hard Folding Truck Bed Tonneau Cover | 448133 | Fits 2020-2025 Chevy/GMC Silverado/Sierra 2500/3500 6' 10" Bed (82.2")

Product ID: 362478800

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Details

Brand
RealTruck
Style
Folding
Exterior finish
Black
Material
Aluminium
Lock type
Tailgate

🔒Ultimate security with auto-latching aluminum panels

🛡️Matte finish resists scratches, marks & UV damage

🇺🇸Proudly made in the USA with global materials

Description

🔒 Secure your ride with style and confidence—because your truck deserves the best!

SLEEK STEALTHY - Matte black aluminum finish that resists scratches and UV fading—style meets function
TAILGATE FRIENDLY - Dual-action tailgate seal lets you open or close your tailgate seamlessly
LOCK IT LEAVE IT - Auto-latching panels lock instantly when closed for unbeatable security
AMERICAN CRAFTSMANSHIP - Built in the USA with premium global materials for lasting durability
FULL BED ACCESS ZERO HASSLE - Operate fully closed, folded, or flipped without blocking your 3rd brake light

The RealTruckBAK BAKFlip MX4 is a hard folding truck bed tonneau cover designed for 2020-2025 Chevy/GMC Silverado/Sierra 2500/3500 with a 6'10" bed. Made in the USA with global materials, it features durable aluminum panels that auto-latch for ultimate security, a scratch- and UV-resistant matte finish, and full bed access without obstructing the 3rd brake light. Its dual-action tailgate seal ensures smooth tailgate operation whether open or closed.

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I loved the variety of products available. Will definitely shop again.

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Customer service was outstanding when I had questions about the product.

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€ 7704.79

Duties & taxes incl.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

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RealTruckBAK BAKFlip MX4 Hard Folding Truck Bed Tonneau Cover | 448133 | Fits 2020-2025 Chevy/GMC Silverado/Sierra 2500/3500 6' 10" Bed (82.2")

Details

Description

Specifications

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Manufacturer	BAK
Brand	RealTruck
Model	BAKFlip MX4
Product Dimensions	172.72 x 20.32 x 58.42 cm; 32.2 kg
Item model number	448133
Exterior	Black
Manufacturer part number	448133
Item Weight	32.2 kg