A tree root added pressure to one of the walls and caused some cracking.

This isn't as vital to get during an initial showing and your inspector should make note of it if you forget it.Plumbing - Check for old galvanized water supply lines - these corrode over time and reduce water pressure.

Currently there is 150k left on the mortgage at a high interest rate of 5.5% at a fixed 30, and I was hoping to lock in lower rates offered to take some pressure off the monthly mortgage payment and increasing property taxes. 

My tenants work on pressure vessels like this. 

At a bigger brokerage all you really get is bigger institutional pressure to "go out and generate leads". 

My point is STR puts more pressure on everything, whereas long term tenants will be more understanding and work with you on repairs or maintenance.

You've never done anything of this size, it's going to take a lot longer and cost a lot more that you expect it to, it's going to cause you extreme pressure as time and expenses continue to mount, while there is NO income coming in.If you have at least $200k in cash on hand that you're willing to put into this, I'd say NO. 

I have also found the truck mounted systems extract more water so the carpet dries faster.

The pressure on a forced air furnace is not likely enough to cause any issues I would imagine.

We need to keep the pressure on with a volume of outreach.Here is a post with more details and resources to contact your legislators.Self-Directed IRAs at Risk - Your Advocacy Is Needed