Have you ever seen a crew cab?
No Chevy did NOT make them, they were all sent to coach companies and made into a crew cab, three door or an extended cab. They were long beds originally, cab cut up, bed chopped off, rear doors were hand made, skinned and put on.

This is my dad's truck, I found it in a field about 100 miles from my house, it was a 2-1/2 ton wrecker. He took the cab and put it onto a stretched '72 3/4 ton frame, added the new front sheet metal, bed, motor and everthing new. This is one nice truck, one you dont see very much. He really likes how it turned out.