However, I’ve noticed that larger homes (3-4 bedrooms) tend to have difficulty renting as MTRs since most MTR tenants in our area are traveling healthcare professionals, typically renting solo or with one other person.

The quoted exterior price per pier (concrete) ranged from $225 - $375 per pier.

The photos online won't be of much use to you as the photos where the money spend is at are in the basements, attics, and the exterior of the house, and every corner of those if that helps.

I’m not sure how the financing would work for such a move, being that I have 50k in student loans and 216k owed on the primary residence and work as a traveling nurse on a modest income.

Siding & Exterior Trim12. 

I've stayed in places like this myself before while traveling but back then I never looked at what the market was like in those places.

It would be good if traveling with pets required number and type but that is just nice to have. 

Nice job with the project. 70k budget is really good considering exterior work was involved.

the answers to all of your questions are... go find those people in person, which is difficult to do out of state unless you're traveling frequently to your chosen market. 

We've debated adding a printer station to our units because it would be awesome if we were traveling to have the ability to print where we were staying.