This is a Dodge A series van. They supposedly were available with up to a 426 Wedge engine although most had the 225 Slant six. This van may have had a V-8 engine, but the five lug front wheels indicate that it was originally a 1/2 ton. This was a conversion for towing 5th wheel trailers, usually campers. The dual rear wheels was a kit to replace the single rear wheel but not change the rear end to a regular dually. This kit didn't work very well as there was too much dish.
Mad Mackie in CT:laughing::biggrin::smile: