I'd also like to add that all is not lost. Years ago, we were boon docking and there was a couple of travel trailers a ways off from us. It turns out that it was a young family and their kids and in the other TT was the grandparents. The grandfather had arthritis so bad he had a battery powered wheelchair with all terrain tires and he went all over our area and bear in mind that this was a FS area, dirt, rocks, you name it and he got around. His TT was specially equipped with a ramp at the door that was extra wide, for him to drive up into and the bed was low for him to hoist himself into bed. He recharged his batteries every night with a generator.