Think of all the horror stories about tenants maxing out the heat with their windows open during the winter, deliberately running water bills up, etc.

I had some minor water leaks and some subfloor issues that overall did not amount to much, but I had to have an vacancy to fix later.

We couldnt have a large hole in the ground fill up with water that we were going to place a septic tank in.

It goes in much faster and is more water resistant. 

Add another $20 a month for that.Add in HOA fees ($300 a month; shown in your link), Gas, electricity, high-speed internet, water, trash and snow removal. 

Make sure that this won't put your future buyer in hot water with the VA or his lender. 

This was after the foundation was given the OK by 2 separate inspectors and occurred due to lack of support under the house, soft soil in Florida, and lack of gutters to disperse rain water from the foundation.

Roof is approx 15 yo. 4 water heaters been replaced in past 5 years. current brings in $5200 month.

Ask yourself what makes your property worth $2100 (incl water) when rents in the area range from $1500-1800 (assuming that doesn't include water)? 

Where is the water flowing when it rains?