The Tape Measure Mandate: Why Your New Tonneau Cover Hangs Over Your Tailgate
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You are completely exhausted from worrying about your expensive tools sitting exposed in the bed of your 2014–2018 GMC Sierra 1500 Crew Cab. You decide to finally lock it down, so you go online and order a premium, hard-folding aluminum tonneau cover. You know you have the "standard" bed size, so you click the 6'6" option and check out.
The massive freight box arrives. You unbox the heavy-duty aluminum rails, set them on top of your truck's bed caps, and your stomach instantly drops. The tonneau cover rails extend nearly a foot past the end of your tailgate. The cover is massive, and your truck bed is way too short.
You just fell directly into the Bed Size Trap.
Truck manufacturers love playing games with bed lengths. Just because you have a full-size Sierra Crew Cab does not mean you have a standard bed. In fact, most K2XX Crew Cabs were built with the 5'8" Extra-Short Box to make them easier to park in a garage. If you blindly guess your bed size instead of physically measuring it, you will order a massive freight item that physically cannot bolt to your truck.
You don't need a metal saw to trim the rails; you just need a $5 tape measure.
In this guide, we explain exactly how to measure your GMC Sierra from bulkhead to tailgate to guarantee a flawless fit. We'll show you why elite cargo engineers at BAK Industries design flush-mount covers, why you need to rip out your plastic drop-in liner, and how to safely armor your payload.
Compare Premium Bed Accessories
Hard-Folding Aluminum, Impact Bed Liners, or Rolling Drawer Vaults?
|
Bed Accessory |
Top Brands |
Tech / Build |
Best For |
|
BAKFlip MX4 |
BAK Industries |
Heavy-Duty Aluminum. |
The Ultimate Tonneau Cover. The absolute best-selling hard cover on the market. Features matte-black, UV-resistant aluminum panels that sit completely flush with your bed caps. It provides incredible theft protection, handles up to 400 lbs of evenly distributed weight, and allows you to drive with the cover fully open. |
|
Full Bed Liner |
BedRug |
100% Polypropylene. |
Knee-Friendly Cargo Armor. It looks and feels like plush carpet, but it is actually a highly advanced, closed-cell polymer that is 100% waterproof and chemical-resistant. It stops your cargo from sliding, completely protects your factory paint, and won't trap water like a cheap plastic drop-in. |
|
Drawer System |
DECKED |
High-Density Polyethylene. |
The Modern Crossover Toolbox. Reclaim your bed. This heavy-duty system features two massive, rolling, weatherproof drawers that slide out over your tailgate, giving you ergonomic access to all your tools and gear. It leaves the top of the bed completely flat to haul ATVs, lumber, or a full pallet of bricks. |
Frequently Asked Questions (Bed Accessories)
Does a tonneau cover actually improve gas mileage?
Slightly, but buy it for security.
It is scientifically proven that a tonneau cover improves aerodynamics by preventing wind from getting trapped against your tailgate (the "parachute effect"). However, the fuel savings are generally minimal (around 1-2 MPG on the highway). You should invest in a premium cover from BAK Industries to protect your expensive gear from thieves and weather, not strictly for fuel economy.
Can I install a BedRug if my Sierra already has a factory spray-in liner?
Yes, but you need an adhesion promoter.
A BedRug installs using heavy-duty 3M hook-and-loop (Velcro) strips. The 3M tape sticks flawlessly to bare, painted steel. If your truck has a rough, textured spray-in liner (like Line-X or Rhino Liner), you MUST wipe the surface down with an adhesion promoter first to ensure the Velcro strips bite into the texture.
Will a DECKED Drawer System fit if I have a 5th-wheel or gooseneck hitch?
No, they physically occupy the same space.
The DECKED system sits directly on the floor of your truck bed and raises the load floor by 12 inches. If you have a massive 5th-wheel hitch bolted to the center of your bed, the drawer system physically will not slide into place.
Measure the box. Secure the gear.
Stop letting the weather and thieves ruin your cargo. Upgrade to a massive, laser-measured hard tonneau cover and a waterproof impact liner to completely fortify your truck bed. Shop our verified collection of premium 2014–2018 GMC Sierra 1500 Bed Accessories.