I already did a ramp2grind2roof in an SUV, I'll redo it for collab hopefully
Bumping is quite hard but possible, just high bump everything. The only thing I don't like about GTA V so far is the motorcycle handling. Like seriously, can't pull a wheelie unless you have high motorcycle skills.
And driving around looks unnatural, I mean they barely lean when turning. Stunting is defo possible we just need to do some research.