Ok so I've got a suggestion - Create a Ram50 section, and combine the Ramcharger/Trailduster/Power Wagon section with the First gen Ram section. There really isn't a whole lot of differences in the RC/TD/PW and the 1st gen Ram. Even the Chilton's manual covers from 1973 up until 93 iirc. The Ram50 is a Mitsubishi Mighty Max and has absolutely nothing in common with the full sized Ram.

My $.02