Would you rent your RV if you could earn $15,000/yr?

You would also need to set up a small business to handle the transactions and collect any taxes your locale requires and report the income on your tax return.

If you skip all the "formal" stuff, you have no protection if a renter runs off with the unit or wrecks it. Yeah it's stolen, but how did they get their hands on it to drive it off. Explain it to your insurance company.

Of course I am biased since our unit is HOME.