Eric,

What year?

From 47-55, the rear floor cover in GM Suburbans was glued-on linoleum. Panel trucks did not come with a GM floor mat/cover.

The floor is 54 inches wide - brown linoleum (as used from 47-53; black in 54/55) is available in the correct thickness. It has to be cut-to-fit and grooved, if you are interested in original appearance.

http://www.battleshiplinoleum.com/