Hi Dori,
Another way to solve the problem is to reduce the load on your legs for each 10" rise.
--- Firstly, I would recommend that you add a couple of
step carpets which will reduce the slipperiness of the steps, allowing you to better angle-leverage yourself up the steps.
--- Secondly, I would add an additional hand rail on the right-hand side, so that you can use both arms to help yourself up into the motorhome. The Winnebago part number for the existing hand rail is 137605-02-CHT, or you might find something simple like a generic
RV Grab Handle.
My 92 year old mother-in-law does well with this combination in my Minnie Winnie.
Welcome to the forum.
Eagle5