What are you going to use as a vehicle while they are living in your TC with your truck underneath regardless of whether they drive it or not?
After you drop it off at the campsite, how are you going to get back home?
If you are going to cater to folks who want to experience "fulltiming in a TC", how are you going to ensure they don't refuse to leave it? What will you do if they decide to hotwire the truck?
Are you going to choose the campground(s)? Or will they choose? If the latter, how far are you willing to drive to get it to them?
When the heater stops working at 3 am, are you prepared to drive that distance to fix it?
If they run out of propane midtrip how will you deal with that - have them remove and fill the tank or have you go and do it?
How will you handle the tanks? Will you allow them to fill and empty? Or will you come out and do that?
And as said above, you need to make sure your insurance will cover it being rented. Even without driving the truck, insurance may consider it being used to support the TC against policy - if anything happens, even if not due to user error (tree limb falls, etc), the insurance may refuse to pay out.