The AT4 trim available on the Sierra Heavy Duty trucks, adds skid plates, off-road suspension with Rancho shocks, an off-road mode, the MultiPro tailgate, and a camera system to make towing easier. Also standard are 18-inch wheels wrapped in all-terrain tires.

AT4 Preferred Package - Includes (UVN) Bed View Camera, (UVS) HD Surround Vision with Two Trailer View Camera Provisions, (UG1) Universal Home Remote, (A48) rear sliding power window, (IOT) 8" diagonal Premium GMC Infotainment with navigation, (UQA) Bose Premium Audio System, (U01) Roof Marker Lamps and (K4C) Wireless ...

GMC Sierra HD AT4 models are off-road-oriented variants that combine enhanced capabilities with GMC's premium refinement to practically complement an authentic outdoor lifestyle.

AT4 offers powerful capability engineered to take on off-road obstacles and the tough backcountry. AT4 capability features include: Factory-installed 2" suspension lift. 2-speed AutoTrac transfer case, automatic locking rear differential and skid plates.

The name AT4 is a word play on the 84 mm caliber of the weapon, (84) 'eighty four' being a homophone of 'A-T-4'. The name also doubles as an alpha-phonetic word play on the weapon's role, due to "AT" being a common military abbreviation for "anti-tank".

AT4 offers powerful capability engineered to take on off-road obstacles and the tough backcountry. AT4 capability features include: Factory-installed 2" suspension lift. 2-speed AutoTrac transfer case, automatic locking rear differential and skid plates.

“HD” stands for heavy-duty, and that's exactly what these trucks are: Large, burly, and built with heavy hauling and towing tasks in mind.

Now in terms of off-road again we already talked about the suspension. We talked about the skid plates underneath. But another one we have to talk about is right down here.

Essentially, AT4 GMC is short for an “all-terrain 4WD” vehicle, and is an off-roading package that you can attach to your GMC pickup truck, GMC Canyon truck, and any of the GMC SUVs.

AT4 stands for All-Terrain 4WD. This is a trim level that GMC first introduced with the GMC Sierra 1500 back in 2019.

What is AT4 GMC? Essentially, AT4 GMC is short for an “all-terrain 4WD” vehicle, and is an off-roading package that you can attach to your GMC pickup truck, GMC Canyon truck, and any of the GMC SUVs.

Essentially, AT4 GMC is short for an “all-terrain 4WD” vehicle, and it is an off-roading package that you can attach to your GMC models. The goal is to have a vehicle that works on Perham streets as well as off-roading trails.