I would not sell the house. If you do, you are taking your options away.
What if you don't like life on the road? Where will you live if you are house hunting.
I assume the next house you buy, is where you want to live for a long time.
Don't know about where you live, but here in Puget sound it's a feeding frenzy. Houses going for way over asking. And the competition is brutal
If you sell, you risk paying to much for your next house, and ending up with one you don't really like. Just to get out of the RV. That would cost you much more than leaving the house empty for a few months.
Just me, but I like Having options, and not locking myself in
And to me, the two are not really related. At some point you want a smaller house, and you want to RV for a few months. Trying to combine those two goals could lead to regrets in my opinion