OK, so here we go again straying a bit from strictly diecast, but they'e still scale cars on a trailer, right? Something similar was shown not too long ago:
The Corvair models are all AMT annual releases (top rack 1966, '65, bottom rack 1965, '60, foreground, 1963) that I bought on the cheap on eBay a while back meaning to rebuild correctly but haven't gotten around to yet. The Tonka transporter is mine from when I was about 6 years old. The two cars that came with it disappeared long ago, but the truck itself is still in pretty decent shape.