From my research, seems like healthcare is one of the largest employers in San Antonio.

I've found that Rentometer either overestimates or underestimates the rent depending on the location and condition of the property (e.g a house with updated kitchen, bathrooms and flooring will have a higher rent than a house where everything is 15 to 20 years old but still functional). 

I like that the HELOC functioned more as a credit card, and I only had to pay for what I used, so I had 200K of equity on hand, but only had to pay the interest on 120K.

I would recommend researching the economic growth and landlord laws of each area.Texas has great landlord/tenant laws and one of the fastest growing economies in the world that's currently the 8th largest economy in the world.

There is functionally enough space and parking.

I think it's less a function of people just love the burb life and more that people are priced out of the city as much so they're looking for the "affordable" option ... and that's in the suburbs.And I do think there are still some under-asking properties out there, but anything that's taken care of, that's a remodel (but not an obvious crappy flip), is going quickly now. 

In Oregon my title company would give me update spread sheet of all NOD's going ( but keep in mind I was the largest buyer or one of them in the market at the time. 

I know that is not always the case with functionality items for homes. 

No on-site office, nearly autonomous functionality.

The best I can offer is to tell you to verify that income carefully, and as @Brent Paul said, make sure that income is not about to be interrupted.Sometimes with CC debt, you do run across reasonably smart, stable, functional people with that much.