I was also a travel nurse. 

My immediate thought is, unless you're building the really tiny houses (~200 sq/ft) I've seen on trailers that are still "mobile" so you get around most/all building codes, many of your costs will still be the same.

It should be... a place you lived in, or went to college in, or have family in, or can easily travel to, or want to own a vacation home in. 

For example, a 1/1 occupied by a travel nurse who is gone 12+ hours/day will have much lower utility expenses than a 3/2 occupied by a family with one WFH spouse who is there all day.

It was the movement of U Haul trucks and trailers .

The bonus here is you can write off the milage (if you deduct by the mileage method) for your travel to pick up your mail.

Is there a market for furnished mid-term rentals (i.e. travel nurse, insurance company, corporate housing) where you can generate above market rent and positive cash flow?

A five-hour drive gets even longer when you are traveling to a vacant house.5. 

Even if you have to travel a couple of hours, you have a much better chance of finding someone.How to approach a mentorOnce you've found a likely candidate, it's time to reach out and ask.

If I were you, I'd either find another company, or get a trailer and a helper and go pick them up yourself at Lowes or Home Depot.