(Anything that isn’t your primwry first is only tax free on a pro-rated basis.)I don’t know how you could swing it but…If they gifted you the kand they would avoid their capital gains tax.

You also implied that we don't specifically price deals for our clients and the client's "rates and fees will be much higher".

Hello,I am a real estate investor located to Southeast MA, I own and manage a small portfolio of 23 units and am looking to expand and scale out of state as the returns and market have been quite difficult in my area: due to CAP Rates, specific building class I am looking to invest in, and rising interest rates/minimal inventory, as well as it would be nicer to be diversified and in a more landlord friendly state.  

The tax paid from your lending proceeds should be the equivalent of your tax rate I would think.

Assuming I also use the Airstream for lodging while traveling for personal reasons, would I just take a pro-rated amount of depreciation for the amount of use that is business vs. personal?

My properties average 4.9 star cleaning rating, which is hard to accomplish given how petty some guests can be.

Check their occupancy, nightly rate and amenities.

It's important to know what market rents are for what you are analyzing, many properties are super under rented and you have to get them to market rates. 

Interest rate: Your interest rate is XX% APR interest-only plus X points.

It is the interest rates at which banks lend to each other and is short for Secured Overnight Financing Rate.