If you were an RV business such as a dealer, etc. you would not be having so much trouble finding insurance for this, but as an individual who wants to do this you are not only going to run into problems finding an insurance company that will cover this but some states also do not permit it on a personal registration. While it looks like a way to make some money don't do it. Even many dealerships do not get involved in rentals because of the many pitfalls.