A Collection of Questions

I just had some general questions about the game.

What is the actual real life purpose of these Hoonigan cars (ex. formula drift cars are for drifting)? Some seem to be race vehicles while others are just designed to burn tires like the Nova and the twerk stallion drifts I assume? If anybody could drop me the use of these things it would be much appreciated.

Is there any way to put race tires on the Forza edition speed cars? A lot seem to have either drag or rally tires with no race tire option which is kind of disappointing if you want to road race the car.

Do the recommended designs actually rotate or do they just sit at the top as they are the most downloaded? I see a lot of generic paints and even at times stock paints being the number one design while people that put hours into paint work to have their stuff not even on the list, but hidden in a search menu that half the people will never use. That would be fine, but these guys get to put up an Audi TT RS or Cadillac Limo for $20,000,000 for quite literally a generic copy paste paint job while everyone else get to sell theirs for like $70,000. They suck up all of the rare cars.

Does anybody else get frequent crashing to the xbox dashboard after changing a vehicle in the Forzathon waiting area?