Those look fantastic! I don't remember them at all. But I do remember my SST Muscle Machines Orange Blossom Special II! I loved that truck! I can still remember the truck doing its famous wheelies. Good times.
Still sounds almost as good as when I used to play with it long ago, and sounds almost like the real deal. In similar if not the same condition as the Monster Worm, though, I think part of the sticker on the side was cut out(I have no idea why though).
I used to have races with the three I had (the van the jeep and this one) and my mini Tamiya trucks (Ivan Stewarts Toyota and Juggernaut), used to use the middle scale nascars, the Rollers never quite could get up and over the cars, but the Tamiya trucks did it no problem at all.