I see no downside to your plans as it seems that you will be selling your current house and moving to another area anyway after you retire. What not try out full time RVing while you're deciding where you'd like to live next! Fair warning though - for a lot of us this lifestyle is addicting and many people have not found their prefect retirement home even after years of full time RVing! :-)
One more bit of advice: buy used. You'll be able to buy a higher quality RV because someone else has taken the initial depreciation hit. Hopefully they will also have fixed all of the little bugs that seem come with a new RV. Just check very carefully for water intrusion.
This is a good site with blogs of many full timers.
http://www.hitchitch.com/links.html It's a good place to see all of the different rigs, traveling and living styles.
