I think it starred an actor whose last name was Brooks (male). I think it was from the 70s, but may be early 80s.
Its about a couple that get sick of living the rat race. So they decide to get an RV and travel across the country. One scene in the middle of the movie has them stopping at the Hoover Dam and they get into an argument and she gets a ride with a trucker, and he hops in the RV to try and find her.