There is no difference between renting and full timing in an RV. They are both an equity losing position. Buying a house is generally considered a safer investment, but being short term, it may or may not be. And certainly maintenance, care, upkeep and unexpected expenses are a factor.
If it was me, I'd rather rent. It's much more comfortable and a lot less likely to leave you stranded (no heat, no water, no whatever,...big expense to fix). Save the RV for when you get to the better destination down the road. Just My Opinion.