I've oft wondered why the Manufacturers don't find room for the batteries, inside the camper. I suspect there is room, in any, of them under the floor etc. A ventilated battery box behind a bay door and less temptation to steal, what isn't seen. I've seen some great craftmanship for add on tool boxes, filter systems, and so forth in Mhs so there is somebody out there that has come up with a solution to exposed batteries on trailers. The propane tanks well.... don't know what regulations would have to be addressed.