/raises hand
You're not alone, I played with those too in the early 80's. I think those were mid-70's sets (pre-minifig). The boxes were rigid styrofoam with formed plastic trays for the pieces and a cardboard flap to cover the trays. The wheels were thesered 2x2 cylinder with a thin metal shaft you could slot into a 4x2 black brick with tiny holes in the 4 sides. So easy to make gatling guns with those