Worst case, the park gets run it into the ground, the RTO tenants leave or stop paying, the homes deteriorate, and you eventually walk away. 

Say 3 months, from when the tenant leaves to fixing it up to renting it again.

They leave early or don't pay, you don't get paid either. 

I am thinking about raising it to $2,450 for an additional 2 year lease, so about a 7% increase, but feel I may be leaving money on the table.

You can ask her to leave at any time.

Re just a 1031 exchange and through a brief phone conversation with an RE attorney, I was advised that I could take a percentage of the profit for personal use and be taxed on that portion, while leaving the rest in the 1031 for purchase of similar income property. 

Leaving the rat race ourselves is one of our long-term goals. 

I am determined to put in more time into my game to be able to leave behind the rat race.

I live in the issaquah Highlands and realtors regularly leave notes on my door asking if I am thinking about selling.  

I would suggest trying to get an unsecured line and leave your primary residence out of it.