Again, I don't want to scare off the idea, you certainly could make some $$$ doing this, just playing devils advocate and making you think about all aspects.I should add, I've had several friends who have rented campers to camp with us, and they've enjoyed the experience and have said they'd do it again over buying their own camper.

Again, not saying I advocate for this, I just find the debate fascinating. 

What looks rock solid now may blow up in your face later.Your documentation SHOULD include collateral and default provisions, along with the same contractual requirements you would have with an unrelated party.Doing the minimum for a long-term transaction makes about as much sense as buying the minimum amount of gas to get your car from point A to point B.

I am always an advocate of educating yourself every step of the way, and maybe team up with someone local who has a track record, and is willing to take on a partner and show you the ropes.

We could be blowing a huge bubble ripe for popping.

Through the electrical line of the heat pump blowing the transformer.

I suppose that a tresspass action is your best bet, but I don't see how it doesn't blow back on your Tenant. 

He is also very straight forward and does not “blow smoke”.  

The design to be 100% complete, (if fact it's better that it isn't so you can pivot and not blow your design budget due to redesign), but it's a good starting point so the contractors know you are serious - especially if there is no established relationship.

It just blows off.