End of full timing may be soon

First of prayers sent for your healing roadlife is right keep your spirits up they have and still are doing a lot towards fighting cancer. You said waiting for warm weather, so I'm assuming your talking May or later. I would kind of reverse your trip. I'd start out on rt 10 to 20 to 40 going to the Painted Desert/Petrified Forest (if your over 60 stop and get a Sr national park pass for like $10 gets free entry for life in all national parks). Then to Grand Canyon South Rim (they'll give you a handicap pass so you can drive everywhere the buses go) you can either stay near train station and take the train. Stay inside the park or there's a nice RV Park just before the entrance with full hookups. I'd then go to the Hoover Dam and tour it and into Vegas for a stay. Then up to Yellowstone, Ohio, Niagra Falls then home. I went in late Feb one year and it's cold and snow in the Grand Canyon so you really couldn't get to appreciate the Grand Canyon fully. Good luck beating the Cancer and have a great trip