A web search shows A-frame jacks and wheelchair lifts for the entry of an RV, but no hardware to lift the shells under that name. You can see Tom's solution here:
https://trickmytrailmanor.com/easy-opening-pg-5. He's not on this discussion group so you'd have to contact him offline.
A lot of people who grow a little feeble to lift the shells switch to a Lance camper. They seem to be one of the better quality options available in a small and lightweight camper.