Winnebago makes the sightseer that is offered with quad bunks. It is a gas model. There are also several Class C+ models with quad bunks. I am racking my brain trying to think of the one my family and I looked at. When I remeber I will post it. The Newmar Allstar is a nice option. It actually comes in a loft model. I test drove it and thought the floor plan was awesome. Good Luck.