Welcome to the forum its a great place to get your questions answered. Have you given thought to one of the stools/steps you see the diesel pushers use. Might be way cheaper and easier then adding steps.
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
I was investigating that also. Banging head against wall trying to find a folding unit that would mount without having to add plates or something to the frame. Finally gave up and got this from Amazon. Only 14 inches high so fits right inside the door when traveling. Rated at 300 lbs. Wife loves it. Also added assist handle on outside of our 206LTD for her.