You should be concerned about insurance issues...at the very least, ask your insurance agent what would and would not be covered. I suspect this may be commercial use and a typical RV insurance policy would not cover it. (Even if it were covered, you would most likely be ultimately responsible and your insurance would take the hit, with the corresponding possible rate increases and so forth, if something were to happen.)
You should probably also be somewhat concerned with registration and taxation issues...the state may not see this as personal use, and possibly not permissible under a normal RV registrationโjust another thing to research and consider.
You can hold people accountable for damage by requiring that they have insurance covering their liability and damage to your property, and naming you as an additional insured. Obtaining such insurance might be a tricky proposition for your renters. You could also require a damage deposit.
All in all, I don't think it's something that's worth attempting on your own. There may be some companies that facilitate private party RV rentals, along the lines of RelayRides and similar for cars, that would have at least some of the thorny legal matters worked out already.
