Young couple gets married, they have no money, so they rent a second-hand trailer in a park. Then they have a child, buy a small house. Then as they mature with a family, a nice house with a pool. Then as their kids go to college, they get a really plush town house in an upscale neighborhood. Finally, kids gone, they decide to see some of the world before they die, sell their town house, and buy an RV to live in. It's the circle of life.