It was completely submerged in water (about 2-3 ft deep at the entrance of the crawlspace).

Tenants pay electric, owner pays sewer, water, and garbage (3,800/year).

So if you already have a buyer ready, you'll generally never have a problem.and I 100% agree with @Jay Hinrichs, just adding the above statements to the rest of the comments.Thanks for the tip I was given another that says it’s water to get the home and buyers are attracted but I think this method is easier!

Part of this is that someone told the PO that she should use the ultra low resistance HVAC filters as long as they're replaced monthly, which meant that there was dust build up on weird places.

Water heater?

We added septic, water, and electricity to two lots that had mobile homes on the lots.

In Marble falls there are lakes and rivers and being near water will increase the value of the land. 

Electricity, gas, water, sewage, trash, HOA fees and wi-fi should be included in the rent of the tenant.

The biggest things you want to look at in the inspection report are the roof, foundation, and moving pieces (hot water heater, HVAC, plumbing system, and appliances. 

Windows can use upgrading (not airtight)Bathroom is dated (plan to replace toilet and sink, and paint walls)Has a small rip in one of the screendoorsKitchen sink needs to be replacedCounter has water damage (raised on some areas instead of flat)I was thinking do minimal update only the flooring, sink, and toilet and rent slightly lower than the going rate for rental properties in our area.