We have an Ace RV with a King bed. It has some room to walk around but the bed is still difficult to make since you can’t reach to the top of the bed. The mattresses in RV’s are light, so what we have started doing is to pulling the mattress away from the headboard so we can make the top part of the bed first. We then slide the mattress back into place and finish putting on the fitted sheets. Bed-making made simple, at least for us.