Lofted beds with walk-in closet underneath. Good when you're short on bedrooms for all of the kids. Loft beds and instead of a closet underneath, it could be the kids "rooms" for private and quiet time.
If you have the wall space in your RV gain two extra sleeping spots, with this space saving Bunk Bed Gadget. I'm thinking wall in garage of toy hauler RV separating living area. Or a great opion for a small bedroom for brothers or sisters!