Hummmmm. SUV's, 18 wheel trucks, aircraft, boats, RV's, buildings, towers, amusement park rides, shopping malls, the list goes on and on. Anytime there is a grade change that humans have to negotiate, until humans can levitate themselves, some form of economical, space saving step is required. Are you expecting your RV to come with a loading ramp, escalator, or elevator? At the price you are willing to pay, I don't think so.
Rather than whine about it, what would be your solution? Architects, engineers, contractors, and industrial designers have already given the problem their best shot!
Chum lee