Outdoor shower/water day for kids.Could easily be made with hollow box uprights, run the water tube through one and the top hollow box with a PVC tube that you drill holes in for the water to run out. Faux paint it to look like copper, really pretty easy.
If you have the wall space in your RV gain two extra sleeping spots, with this space saving Bunk Bed Gadget. Like the wall in garage of toy hauler RV separating living area. How about extra beds for the kids at the cabin