Childhood lego car ID, 1980s early 90s

Question

I'm looking to ID 2 sets I had as a kid,

One was a rally car, it was white with a red base, the wheel centres were red. The driver I think was white upper, red or white lower and with a red helmet and white body with stripe from one side to the other of his upper body. I think the car roof had a sun roof, I think the windows and sun roof were blue tint?

The other was a yellow 4wd with a trailer, which I think had a blue motorbike. From memory the 4wd had a black base, the wheels possibly had white centres.

Answer 1

I guess the second set you describe is 6677 Motocross racing (from 1986):

Answer 2

Could the first car be the 6634 Stockcar?

The driver would be this, maybe the other sets he appeared in would help.