Why not have an unlimited class? No minimum vehicle weight just has to be the Challenger, Mustang, or Camaro platform (Including O.E.M. style engine. You know Mustang uses some sort of Ford engine, Challenger uses some sort of Mopar engine, and Camaro uses some sort of G.M. engine), no full tube chassis, working doors, no tire size limits, and unlimited power adders. Might be interesting