Biggest thing I see is routine maintenance and answering questions from people that are unfamiliar with staying in a camper.

If you're uncomfortable with the situation, find a stronger candidate and be done with it. 

Maybe if you've done 50 deals and they know you are safe, but as a newer investor there are no ways to do this in the real world.In the day before the GFC this is how all OOS turn key worked:WEst coast marketing companies would get buyers  ( these folks are still in business as we know)rehabber in the market  Pick any turn key market would find a home that they could buy rehab and sell at 65% ARV  which today pretty tough but in those days my company did close to 2000 of them as the A and D lender.So we would require ONLY 1k down from the borrower  ( so not no money down but pretty close)  I would fund the purchase and rehab the rehaber in the market  say Detroit Chicago Memphis Jackson KC Indy those were all my markets. would do the rehab and once it was done they would do a refinance now my LA based buyer was already pre approved for the take out ( REFI) Just subject to a 442.. we routinely spun these deals in 90 to 110 days start to finish.. the LA based buyer would then do a 75% cash out refi and pay me off  and they would normally pocket about 5 to 8k in cash that was to be used for reserves.. so no money down and actually cash out.My flipper made his money the west coast marketing guys got their commish and I made my fee's on the HML..  

They have become somewhat combative towards me and have begun making the tenants in the adjoining unit very uncomfortable (threats, yelling, etc).

If you're uncomfortable, change the line that waives the right to inspect. 

The decent producing Realtors, the ones that sell a fair amount of homes, already know what's up and aren't doing a lot of hands on hips drama routines with pointless threats and all that (top producers never do drama routines anyways, it's a characteristic of being a top producer, and in case someone takes this as gendered commentary because I referenced hips, it is decidedly not gender specific, drama propensity is equal opportunity in this case), but the lower producing realtors are all working on their Ph.D's in Drama Llama Sciences. 

Then start doing routine follow up so they know your serious.  

He’s solid but I’m not sure if he does routine work like you’re looking for.

@Ash Clarke I have heard of people setting up rentals as a "layover house" for the airline industry for flight attendants and pilots that routinely fly the same route that want to have a room in their non-home city that they can go to instead of a hotel.

I go in a routine and ritual to grow my real estate business as much as I could.