Transforming the Avalanche from a four-passenger vehicle with a covered cargo box to a two-passenger pickup with a full-size box requires no more than a couple of minutes. The process is as easy as removing the tonneau cover sections (there are three), removing the rear glass, folding the rear seat sections, folding the midgate, and voila, you’ve just bought yourself a couple extra feet of truck bed. Sort of. Keep in mind that you’ll be sacrificing the rear bench seat and subjecting the interior to damage from any cargo you’ll be hauling, not to mention that with the cab wall lowered/removed, you’ll essentially be driving with a huge window open. Just something to think about before buying that pine Christmas tree in December.