I knew someone who did this with small stick-builts. He advised that unless you could do your own repairs that it would not be cost effective to rent out. He would deliver to your site and set-up or do longer term. The problem with friends is that sometimes, you don't know them as well as you thought and having them use your kitchen and bathroom......... and everyone has their own idea of "clean" and pets, yet another issue you might be asked to deal with. Also, if the unit is insured, you would want to read the policy and if nothing has changed, the tow vehicle assumes the liability, I think? I know, everything is so complicated these days.