Personally, I've found many mobile home parks not to even be listed anywhere on the web.

The signature includes the web address for the investors.

I bet the seller would be motivated if you made a cash offer with no contingency and any weasel clause.Joe Gore

However, I now have a concern.A former person I had contracted with in my digital/web business was involved in some sketchy nonsense. 

@Benjamin Andrew Pogue  Let's interpret "optimal" and "sweet spot" to mean:a) you can find one fairly easilyb) you can rent it fairly quicklyc) it will cash flow and the likelihood of you losing money is lowWith those assumptions, your best bet is 3/2/2 in a subdivision where it is easy to determine value (After Repair Value based on comparable sales AND likely rent) and where home prices are 50-80% of the median home price for your area (working class neighborhoods). 

the above is off the NMLS web site  if you would like to check each state before you buy a NPN.

you sound like me not too long ago....... i so wish I would of held out for renters with better credit..... late every (EVERY) month atleast a week or two..... have to constantly call to get rent..... willing to bet that the one month deposit i made them give up front will ( in their head) be the rent i dont get before they move out.

You need to speak to a human and not try to get your answers from a web form. 

-Facebook: I use Facebook to increase web presence.

I sent this web link to the contact person at various lenders to ask if they do cash out refi under that exception. https://www.fanniemae.com/content/guide/selling/b2/1.2/03.html