This is the topper I use, it's called a Flip-pac. They are made in Riverside CA, cost about $7k, and fold open into a camper. I have added a fridge, a stove, a heater, a water tank/heater, water pump, toilet, etc. To make camping very fun and easy for the family. It gets to the good spots In the winter it becomes the meat wagon, elk and deer, then the best of all - DUCKS!