The MultiPro Trap: How to Safely Mount a Bed Extender to Your GMC Sierra
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You love the 5.8-foot short bed on your new 2019–2026 GMC Sierra 1500 for daily driving, but the exact second you try to haul a dirt bike or a stack of long lumber, you run out of real estate.
You need to leave the tailgate down, so you go online and buy a standard, universal bed extender to keep your gear from sliding out onto the highway. You grab your tools, walk up to the back of your truck, and instantly realize nothing lines up. The mounting holes don't exist, and the pillars are completely shaped around your 6-way MultiPro Tailgate.
Worse, you try to mock the extender up, and you realize that if you flip it outward, it sits directly over the MultiPro's inner drop-step. If anyone accidentally presses the tailgate button, the inner step will violently smash directly into the aluminum extender cage.
You just fell directly into the MultiPro Trap.
Because GMC’s highly advanced tailgate completely altered the rear architecture of the truck bed, standard bed accessories simply do not fit. You don't have to risk your cargo or drill holes into your expensive paint. You just need specialized engineering.
In this guide, we explain exactly how cargo engineers at AMP Research developed a highly specific, No-Drill Bracket Kit to safely bypass the MultiPro architecture. We'll show you how to safely manage the inner tailgate step, how to clear your tonneau cover rails with the HD Sport, and how to instantly add two feet of enclosed cargo space to your Sierra.
Compare Premium Bed Extenders
Classic Maximum Volume, Tapered Sport, or Rolling Cargo Managers?
|
Extender Style |
Top Brands |
Primary Feature |
Best For |
|
BedXtender HD Max |
AMP Research |
U-Shape Design. |
Maximum Volume. The classic, wide U-shape provides the absolute largest amount of enclosed cargo space. Perfect for trucks without tonneau covers that need to secure wide, bulky items over the open tailgate. |
|
BedXtender HD Sport |
AMP Research |
V-Shape Taper. |
Tonneau Compatibility. Built from the same lightweight 6063 T6 aluminum, but features a tapered V-shape that allows it to easily pivot inward and outward without hitting the side rails of your tonneau cover. |
|
Cargo Manager |
Roll-N-Lock |
Track-Mounted. |
Internal Organization. (Requires Roll-N-Lock Cover). A massive, spring-loaded divider that slides along the tonneau rails. Instantly pins smaller cargo (like coolers or tools) securely against the tailgate so they don't slide. |
Frequently Asked Questions (Bed Extenders)
Can I still use an AMP Research BedXtender if I have the MultiPro Tailgate?
Yes, but you need the No-Drill Bracket Kit.
Because the MultiPro tailgate changes the shape of the Sierra's rear bed pillars, the standard pivot mounts will not line up. You must add the AMP Research MultiPro Bracket Kit to your order. It utilizes pre-existing factory holes to safely mount the extender without forcing you to drill into your expensive truck bed.
What happens to the bed extender when my tailgate is closed?
It becomes an internal cargo divider.
This is the brilliant dual-purpose nature of the BedXtender HD. When you aren't hauling lumber with the tailgate down, you simply flip the extender inward toward the cab and close your tailgate. It instantly creates a secure, fenced-in "trunk" space at the very back of your bed—perfect for keeping gas cans, tools, or groceries from sliding 6 feet out of reach.
Are these extenders easy to remove if I need my entire bed empty?
Yes, it takes about 5 seconds.
You are not permanently blocking your truck bed. AMP Research extenders use a brilliant quick-release pivot mount. You simply rotate the extender to a 45-degree angle, lift straight up, and the entire aluminum cage pops right out of the truck.
Maximize the payload. Trap the cargo.
Stop losing your gear off the back of the truck. Instantly add two feet of secure hauling space with premium, aircraft-grade aluminum. Shop our verified collection of 2019–2026 GMC Sierra 1500 Bed Extenders.