Do not even consider it if you don't have proof of rental payments for the past year via bank accounts.

Regarding the other types of loans, based on your explanation the conventional loan seems to (on average) have a lower down payment but takes into account the normal loan factors whereas the debt service loan doesn't but with a slightly higher down payment, proof of income generation through the property, and never being able to live in it.

We have the rare guest that breaks into the pool equipment room and tampers with the pool heater to raise the temperature.

I wish they would require proof of ownership/authority, and proof that the property is properly registered and authorized to operate as a short-term rental.

Contract marked owner occupied, there is NO tenant in subject or proof tenant moves out, no rent back from seller... you cannot use rents to qualify, do not rent the property, there are ways this is checked and considered dishonorable.Your wife and children can move in and you can come and go as your service requires. 

So. it’s not uncommon to request proof of rent depositsvia bank statements and corporate/LLC tax returns.

That's how it worked in NJ when I had Sec 8 rentals, tenant was responsible for damages but they're judgment proof.

To meet his burden of proof under IRC 7491, the taxpayer must comply with the recordkeeping requirements of the regulations.

Make your house tenant proof. 

Im a Realtor too so I just pulled in the driveway and talked directly to the owner and it took a few months but I was able to keep in contact and work out a deal.I learned A LOT about the importance of vetting any professional/contractor (and verifying any proof they provide) before they start any work.