I think you need a lot of models There are so many to include I think the best would be a steam followed by a model T. I'll go random here, can't leave out heavy duty trucks from the 30's 40's that were strong enough to haul semi trailers, pony cars, muscle cars, exotics, what ever the first car was that had power steering, cruise control, topped 200 mph and is street legal. Cummins, Cat, etc. Race cars, Grave digger changed monster trucks. Cant leave out Caddillac with the great fins, the bubble top Chevys, almost any VW to the luxury of Rolls Royce and such. Too much and where do you stop? Ampicar? LeCar? Junk but paved the way for cars like Geo Metros, and other tiny cars oh the original MINI I can't stop now.