Most cities don’t want a mobile home park in their city limits because the tenants take more money out of the tax system than they contribute.

From there, adding discipline will get you to where you want.Instead what you're doing is advertising you have money, no knowledge and are going to have the average BP RE agent(bottom of the barrel quality) come here to promote their services with no regard. 

I plan to BRRRR this property to pay off the seller and get my money out and was wondering if you anyone has any suggestions on banks that can do refinances for mobile homes.

It earns more risk-free in money markets than your mortgage rate probably. 

I tied up $65k of my investment money for 3 years and sold a property after a judgement for a 5.8% return.

Typically people charging for that service are doing it because they need the money...if you catch my drift. 

These are some of the most successful people; CEO’s, tycoons, celebs, old and new money and investors on the planet.

When you have a duplex and tenants on both sides stay for ten years, it almost guarantees that something isn't right.I would study your market and determine the value of your rental, because I bet you are losing money every month.

In your scenario you'd have a potential tax event on that $200K difference.Here's a creative way to access most of that money tax free however. 

Seems like a great place for someone with little money to start.