There is a next stage beyond a Toyhauler, common in racing - a race car hauler with living quarters at the front. Forest River makes them, for one, and they are usually custom made so you can get them how you like them. A friend had one that was 48' long, had a 20 foot living quarters up front just like any RV/fifth wheel, and 28' of car space in the back. He ran a business racing formula cars and could take 4 cars to the track with that rig. Heavy, though - around 20K loaded, triple 7K axles.
Brian
2005 F250 Supercab, Powerstroke, 5 speed automatic, 3.73 gears.
20 ft race car hauler, Lola T440 Formula Ford, NTM MK4 Sports Racer
1980 MCI MC-5C highway coach conversion
2004 Travelhawk 8' Truck Camper