@Drew Sygit I agree that a real estate agent may not have enough incentives to screen for a good tenant but then, tenant churn and maintenance calls are good business for property managers as well. 

We've found great apps that plug-in with our AirBnB booking calendar and allow routine processes like cleaning to be automated.There's a great opportunity nationwide as platforms like AirBnB & VRBO are experiencing a shortage of hosts.

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

Requires yearly maintenance meetings (to prevent piercing corporate veil).

It's a nice balance between the benefits of flipping (without the high risk) and the benefits of cash flowing rentals without the hassles of dealing with regular renters (little money down and bugging you with maintenance and repairs).

Just my $.02, I think 12% CoC ROI is agressive in this market, at least in the areas that allow for decent potential future appreciation and that typically have a lower-maintenance tenant base.Personally, I am happy with an 8% CoC ROI because this is roughly equivalent to what I might expect from the stock market, leaving amortization and appreciation as "gravy."

You have your vacancies at 2% and maintenence at 3%.

You have to consider purchase and installation costs, plus any maintenance over the life-span of the system.

In many cases these are better investments: longer term leases, no tenant calls at 3am (at least for office, industrial, retail), tenants often sign NNN leases so they cover your insurance, taxes and common area maintenance.  

I heard about a college student 20 years ago that got a summer job doing maintenance in a trailer park.