I've made the Yellowstone trip as well as at least 8 round trips from Colorado to Seattle, Philadelphia, Alabama, and Illinois in our MX 75D. My suggestions would be...
1. Download the Plugshare app and study all the options and comments for the charging spots in Yellowstone. We used the technique of only charging at spots listed in Plugshare, and only after getting approval from the various hotel/restaurant managers. They were all extremely friendly and accommodating. Now, we were in a tent camping area at Bridge Bay with no electricity. But, if you are booking an RV spot with electricity, then life becomes much easier.
2. The critical adapters to have are the J-1772 and NEMA 14-50. I made a TT-30 adapter for using 30 amp (120V) service at campgrounds but did not need it for the Yellowstone trip. I've used it at state campgrounds. Do not buy a TT-30 adapter made for RVs...it's not wired correctly for charging an EV. If you want to buy one, there are companies that sell them such as
AC WORKS EVSE Charging Adapter RV TT-30P 30 Amp Plug to 50 Amp Electric Vehicle Adapter for Tesla Model S-EVTT30MS - The Home Depot
3. Don't waste $500 on a ChaDeMo adapter. You won't ever need with today's supercharger network reach.
4. I built a repair kit for tires, rather than a bottle of Slime. Once you slime a tire, most tire stores will not repair them. Included in my kit: small scissors jack rated for a weight greater than the largest Gross Axle Weight Rating for the car, Tesla style jack pad (homemade or commercial), a tire plug kit (available at all auto parts store and Amazon), pair of needle nose pliers or ViseGrips, small pocket knife for cutting excess plug material, breaker bar and long socket to fit the lug nuts (ideally you would plug the tire without having to remove the wheel), small 12 V air pump that plugs into the accessory socket in the car, and for the MX and MS, a lug nut cover removal tool (I just use the needle nose pliers mentioned above).
5. Take a bottle of window cleaner and some rags for removing bugs from windshield and headlights while you're supercharging.