However, I want the original investors cash to be treated differently than new cash.

As they reiterate in the BP Podcasts time and again, real estate is a business and the best ( … the only) way to excel is to treat it like a business.Keep that mind working.

Most buyers will view the property with a sense of pride and will likely treat it better than were they mere tenants.And the final pro that pops to mind: if a seller is no longer interested in real estate, but still wants "Mailbox Money," then this provides a solution.

If you have a single member LLC, the Federal IRS treats it as a "disregarded entity" --- basically, it doesn't see the LLC as another legal entity so the LLC's filing is with your own personal return. 

I have a lender that I have worked with for several years and they have treated us well but they won't finance a MHP with this much vacancy.  

Try to make it abundantly clear who is in charge of the project and who is just participating passively and thus should be treated like a LP. 

There was never a time I could think of a buyer treating me bad because I was new.

I kind of see it as being treated in own category via SchE. 

Some here will treat their STRs as a hotel: turn and burn as fast as they can.

If I were still a "real estate hobbyist" (as my partner calls it) running small SF portfolio, I might show sympathy for the individual and at least look at their overall application package including income verification (but I would still call the credit reporting agency to verify accuracy).Now that I'm running a multifamily business with a millions of investor dollars at risk (and if you treat your portfolio like a business), I stick to pre-established processes.