My suggestion to improve your cash flow is to find another bank/lender.

Do you have any suggestions on how we can secure long-term financing under these circumstances?

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.

Since this is my first project, I’m very open to any advice or suggestions—especially regarding potential obstacles I might not have considered.

I suggest gradually assembling a reliable maintenance team that includes HVAC, plumbing, and other essential services.Tenants are responsible for providing access to the property.

That ship has sailed and it was never at the discount you're suggesting. 

Starting with the Right PropertyGiven that this is your first STR and you’re planning to manage remotely, I’d suggest focusing on a market with a strong local infrastructure for short-term rentals—like Panama City Beach or Destin.

Its very simple to figure out & use and it gives enough metrics to analyze single family properties. 

His reason was the only thing he knew to do with the proceeds was to loan it back out at 12%, and he would be "behind" where he is now in cashflow.His proceeds would have given him options up to and including PE, but he is a simple man and in his case holding was the option for now. 

I would also suggest researching the developer’s experience with similar projects.