I'm sure I've said this before but maybe not on this thread. Pretty much any "modern" 4wd touring car can be competitive in VTA especially at Slots. We have seen HPI Pro 2/HPI Pro 3 in the A-main, TC3/TC4, XXX-S, and TT-01. I won the A-main last week running 4-cell stock with a HPI Pro 3 and this Friday I was 4th. I've won a few A-mains with a TC3 as well.
Basically if you have a 4wd TC, best to spend the money on tires and your favorite muscle body for the class. Many racers are using lipo/Novak 21.5 motors for less maintenance but if you have 4-cell NIMH and stock motor/speed control then use that.
If you do have a TC, but don't have the body or tires let the racers at slots know. Between all of us we could help someone get setup for the night to give the class a try.