I have totally given up on Quickbooks though it remains the best accounting software for the non CPA type 

Can you please provide me a copy of the MHP evaluator?

In the past, tenants at this location have always used it as is, without modification.

Since you are paying cash, you can buy it in an LLC right off the bat, so that's fine.

So I was just wanting to get opinions on the best way to leverage the equity and heloc I have? 

Be sure to explore all around the forums as well as many of the FREE tools that Bigger Pockets provides.I am on the lending side of things and am always happy to hop on a call to discuss loan options that are out there, even if not offered by my resources.

Typically with owner financing they will want 20% down to protect themselves and make sure you have skin in the game.You could propose it but just wanted to let you know that this is not a very strong offer. 

Are you in the Atlanta Market?

The reality is real estate isn’t just about appreciation and cash flow—it’s also about survival when things go south.Many new investors operate on razor-thin margins, believing that rental income will always cover their expenses.

Personally if it is generating $110k cash flow whether before or after taxes, I would just sit in it.