C/30 Extra long wheelbase question

[Katrina/10]

Back in the 70s I remember seeing 67-72 model trucks with single rear wheels, 8ft fleetside beds, and the rear axle set back closer to the rear bumper. It was so far back, the spare tire was relocated to a compartment in the bed side in front of the axle. These were definitely C/30s, possibly camper specials. I saw them usually in RV campgrounds carrying big slide-ins or pulling heavy trailers. I have been browsing this site for quite some time and never seen or heard anything about these trucks. I believe they were factory produced and would like to know if anyone else remembers these or has any information/pictures of them. They were not Longhorns.

Gary