Not a full timer, but here are a couple of links for your husband to research.
1. Has links to articles on tax friendly states -
http://www.luxurycoachlifestyle.com/...nterested.html
2. This is a link to a really good article on solar power that will allow you to park where ever you want and not depend on hookups or your generator -
The RV Battery Charging Puzzle « HandyBob's Blog