LX track (LX6+softer tyres and rollcage+maybe SOME downforce) would do great with the "RAR" as long as both stay out of the GTR class...small or big.
They both would be great track cars that require constant driver attention. This doesn't mean they should be as hard to drive as the current RAC...they just shouldnt be as point and shoot as the big GTR's.
DP1 needs neither class nor competition.....just like the FOX.
Let it be standalone and compete in races with driver skill rather then the "correct" car for a particular track.
BTW, great job OP and traxxion...both look extremly nice.
Sadly none of this will ever make it into LFS unless the Devs turn into completly different people over night.
We've seen some great suggestions and effort over the last few years (car and track that is) and I've yet to see even a response from the devs about them.
We ARE getting a new AI though......