Slides can have electro-mechanical and water leak problems but they may be worth it if you really need the elbow room. We have always preferred to be outdoors weather and insect pests permitting. A rear bedroom with access on both sides of the bed is highly desirable. We have used two trav-sacs zipped together so don't have to make bed. You will need at least a 27-foot class C to have a rear bedroom. The added benefit is more storage space in cabinets and cargo hold, less clutter in living area. The overhead bed is for kids/people without arthritis, etc.