My grandpa had one at one time. it was a 95 or 96 extended cab 2wd with a 302. does anyone have any info on this truck? it was very fancy and a sweet truck. was it rare or what? i guess it was the only one i ever saw.
Mark III is a van/pickup conversion company.
Essentially, they get a stock and plainly equipped van/pickup, throw in a set of captain chairs, a dank set of wheels, vanity lighting, and plush carpeting/headliner, then sell it marked up with the options. They usually leave the engine and drivetrain alone and focus on aesthetics of the vehicle.
Other firms that do this are Waldoch Conversions, Jayco, and Explorer.
I remember my dad's old Waldoch Chevy van and a friend of mine had a Mark III. Really nice conversions!