Even if the owner seems like a really nice person, they will micromanage the builder and not like the specs of the house the builder needs to do, and/or the timing in which the builder gets it done, etc. 

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?

The person calling you is on a money grab. you do not need a wyoming trust. 

In person control before controlling re from the distance.

Awesome conversation! 

I have a 2-person unit with a glass top dining table and it has worked well.

However, because I am unable to make trips to scout locations or look at homes in person.

I personally use Quickbooks online and have a virtual (remote/nonlocal) bookkeeper.

Is it possible to have a phone conversation? 

You look like the kind of person who is going somewhere.