Easy way to look at things are any institutional, or Hedge funds buying in this asset class.

No. all the institutions will calculate that you paid off the home early and will pay less interest. 

I don't know of an institutional lender that will touch sub-to's.

Are there mobile home lending institutions?

Looking to apply for a HELOC, and was inquiring what institutions I might want to look into.

In a subject to arrangement, this usually prevents future second mortgages from being filed by the new buyer (Billy), especially by institutional lenders like a HELOC.

A GP who has done 10 personal deals in the small MF (5-50 units) space but was a grocery store manager for 7 years isn't the same as someone with 0 personal deals but who worked their way up as an asset manager at an institutional or bulge bracket firm for the same amount of time. 

Someone else mentioned CAI, this is the Community Association Institute, definitely go check them out, I think they can help lead you in the right direction

They are in favor now, and may continue to remain that way long term, but 10 years ago, mobile homes were very much a mom and pop business, with little interest from institutional players.

We have institutional buyers as well as individual investors too if you would consider not selling retail.