Waking Up in Reno (2002)

Roy and Candy and Lonnie Earl and Darlene are two married couples who thought they knew one another, until they decided to take their dream vacation together. Hitting the road in a brand-new SUV, they're having the time of their lives until something funny happens on the way to the monster truck show in Reno. Turns out Lonnie Earl has a thing for Candy, and when evidence of this starts to surface, things really start to heat up.