MPC "Altered T" is 1/20, with the Logghe chassis from the 1/20 funny cars. There was also a sand buggy (!) based on that chassis, with the T-bucket body and Chevy engine.
Gridiron Grabber and Hard Hat Hauler were both 1/20 scale, with another chassis and 392 Hemi engine. I've got an eye open for one of those for the engine for an AMX funny car. The Hard Hat Hauler was an actual show car that probably still exists.
Popcorn Wagon and Chuck Wagon (1/20 again) shared yet another chassis and FE Ford engine. Popcorn Wagon is an actual show car (Carl Casper, IIRC) and may have been shown as "another" car with a different body on it, which I believe he did from time to time.
--Mark