Premise: Millions of Americans hit the road in their recreational vehicles each year, but these days it's not all about family bonding time. The series ``Extreme RVs,'' takes viewers inside incredible megamansions on wheels. With unbelievable amenities and designs, these vehicles put most homes to shame. In each episode, the teams from three shops put it all on the line through each cut of metal, every bolt they turn, and every gallon of paint they spray to perfect the caravans. With custom-themed designs and luxurious interiors, the builders must keep on budget and finish on time.