I race ( if you can call it that) on both carpet and dirt.
RJ Speed COT spec class cars ( x2)
Nastruck is a ADX chassis, LRP Stock Spec esc, Novak 17.5 motor.
Losi SCTE 4x4 brushless : Mamba Max Pro, Reedy 5.5 motor, Savox servo
Associated RC10 Short Course truck, brushed and stock
Losi TLR 22 buggy Novak GTB esc and 13.5 motor.
I've had some others. Racing classes are popular then die out.