The recent and on-going collections against is an easy rejection. 

So instead I focused on getting the cabins ready from a distance (I had planned on going out for closing, but couldn't travel because of lockdowns).

I knew when I ran the numbers that it was a good buy.

The properties are elderly and need regular ongoing maintenance.

Research is on going so expect to see changes to what we know.Bottom line is that the chances of getting COVID19 from a surface is quite a bit more difficult than first thought.

I suspect the capex/ongoing maintenance costs will hurt long-run and the condition of the property would be the defining factor. 

If you hold long enough to pay down the mortgage substantially, collect some ongoing cash flow and get a little appreciation you will do fine. 

I ran the numbers and it seems that your ROI (%) would've been greater on a 2-year time frame than a 7-year timeframe, I can be wrong. 

In addition, they'll be constantly hit with more and more ongoing cases from the after effects of the past couple of months. 

You would have ongoing filing requirements with the State and would need to keep business records and documentation.You also want to look at whether a pass-through entity helps your bottom line and your taxes.