I have similar questions about a mobile home, it is very close in answers.
I found an “insulation paint” that is “space age” stuff, I’ll have to find the link, but it would be great for your RV, Breathial…
Plug all air leaks, big plus.
I once had a small >500 sq. foot house, and wrapped the eaves to the ground with Plastic. You could get a couple of the huge tarps and cover the RV while stationary, it could really make a big difference! I was able to reduce my stats by a lot with the plastic wrapper around the house. All that was open was the front door, the back was still OK for emergencies, but covered.
Just a couple ideas
"ROGUE ELECTRICIAN" Hoping to be around to re-energize the New World.....
Cogito, ergo armatus sum