High Quality Content by WIKIPEDIA articles! The Chevrolet Avalanche is a four-door, five or six passenger sport utility truck sharing GM's long-wheelbase chassis used on the Chevrolet Suburban and Cadillac Escalade EXT. Unlike the typical pickup truck, the open bed of the Avalanche opens to the back seat area via a folding panel (marketed as a 'midgate') and removable rear window. A series of three removable panels form a watertight top for the cargo bed. Additional storage is provided behind each wheelwell, accessed by locking flip-top panels and usable as self-draining ice chests. The name Avalanche derives from the dangerous and sudden collapse of mountain snowpacks known as the avalanche.