Would this be a good time to seek that out private money for 12-15% with as much skin in the game as I have, or would it better to seek out conventional financing after the single family is complete?      

At 20% down, that's your skin in the game, IMO a motivated seller should be accepting that.

But there are many ways to skin a cat and everyone's situation is different.

I have no skin in the game here -- I have not done any transactions with Neu Real Estate Group yet. 

Also makes them put skin in the game.

No skin in the game.

My plan is to "wholesale a mhp," so that I can have some "skin in the game," as it were, for buying my first park. 

Its important to set boundaries, be professional and not let people get under your skin.

The downside is they will only go 50% LTV so you would have to have a lot of skin in property. 

However, you can make money managing properties without any skin in the game.