the Silverado HD uses independent front suspension with torsion bars. The rear axle stays leaf-sprung, though, rather than switching to coil springs. On the Trail Boss, Rancho shock dampers ...

But only on the rear axle, and since gas ZR2s get lockers on both ends, it makes sense. The production Trail Boss model won't be as extreme as the ZR2, but it still gets lifted suspension ...

While the Trail Boss package may add Z71 suspension, all-terrain tires ... one step is in the corner of the rear bumper, and of course, GM's Multiflex tailgate has an integrated step-up mode ...

Compared to other versions of the Colorado, the ZR2 Bison has a 3-inch suspension lift ... is available in five different trims: WT, LT, Trail Boss, Z71, and ZR2. For most buyers, something ...