Vuitton also made some of the first specified trunks, like the compartment trunk, the bed trunk, and the watertight trunk.

FORBES: Voyage En Capital: The Louis Vuitton & Paris Show

The real trick, though, is that the back of the passenger compartment folds down, allowing the bed to stretch straight into the cabin.

CNN: Chevy Avalanche: Big truck for the real world

Also, some cargo just isn't nice to have in your passenger compartment. (Bags of fertilizer or pieces of greasy machinery come to mind.) The Avalanche's bed is covered in a tough plastic lining, easily hosed out or just left harmlessly filthy.

CNN: Chevy Avalanche: Big truck for the real world