I have NEVER seen a pro forma statement put together by a seller or broker that 1.

As a broker, I do have access to about 15 companies that do helocs on investments! 

Most Brokers on this site work very specific markets.

In fact, if you qualify as a sole proprietor (real estate agent, broker, small business owner), you can have something called a solo 401k and use that to purchase property.

If not, they may want to speak to a mortgage broker local here in Florida to help expand their options! 

The combination of multiple income streams (motel rooms and RV spaces) and its location near outdoor recreation and a nearby urban center makes it an intriguing deal.I have experience as a broker working on RV park and mobile home park (MHP) transactions, and I’m currently working on deals in this space.

Looked around the site, I only see lenders, property managers, agents, brokers, etc. but not developers?

Quote from @Paige Corsello: Do any brokers out there know of any lenders who offer 80% TLV on a noo SFH cash out refi?

I am a private money broker. 

Or are you alluding to a 85% DSCR  refi, since I thought brokers who offer HELO's can provide 80% CLTV or am I mistaken and it's 75/70 CLTV depending on rate & cash we're looking for?