The practicing of backing up applies to trailers. With a motor home you unhitch and move each vehicle separately.
If you do the math, most people come out cheaper with a trailer.
If you are 62 or older you can get a "geezer pass" for free admission to national parks. With it you can camp for half price. We have camped for as little as $4 a night in National Forests. The lifetime pass costs $10, a super bargain.
We never went full time, but have gone to Nova Scotia, the FL Keys, Seattle, Vancouver BC, San Diego, Mazatlan and Cabo San Lucas plus a lot of places in between. We are now 81 & 82, so we sold our Casita 17' trailer last summer after one last trip to the Great Smokey Mountains.