In his specific situation, he would have realized total repayment savings of $76K on 212K in principal balance.

I realize now that I want to be financially independent!!!

Should I try and rush and go through this whole process again and find a lender that will approve me, or should I take this as a realization that I need to step away from this deal?

Once you get a better grasp on clientele you will realize the clients that push requests TOO far right out of the gates are tire kickers most times.  

Hey folks, I've done my traditional banking with a local CU, but when I was checking on rates for savings accounts I realized they probably won't meet my needs for the new business.

i quickly realized this was taking up a lot of my time and 9 times out of 10 they used my quote to as a negotiating tactic to reduce the sales price, then performed the work themselves or put it out to bid again. 

Moreover, what are some benchmark rates we could expect to pay on it (I realize current rates are not representative of historical avgs)?

We lived in the house for 3 years and realized this week to week life is not for us.

Realize that many of the residents who are in MHP don't have many assets to chase after if they get behind on rent/utilities, so the risk can be higher than other types of investments. 

If you approach it realizing that it’ll take work...