Also, my partner is slightly concerned that if he raises the rent, it may push them out and then he is left with an empty property, with the only quick option being government housing.  

I close on my first mobile home park Friday.

There are alot if of mobile home parks and manufactured homes that are being bought torn down and all kinds of different types of homes, condos, and townhomes being built. 

We focus on C/C- properties, and I would suggest you stop looking at the score, and be more concerned with the report.   

And since they weren't going to have those mortgage payments anymore, and the rent payment was going to be significantly lower than their old mortgage payments, I wasn't concerned at all about their ability to pay. 

I agree with Dan's concerns and adice to you.

Looking for more information on buying land, installing mobile homes onto them, and renting them out.

You should let them know what the issue was and tell them your concerns.

Would there be any concerns in moving back to Anchorage at a later point and into a 4plex, from a mortgage point of view?

I think rents could be raised to $495 per unit, but that's not a huge value-add, and I'm concerned that with these being studios, expected higher turnovers would kill the deal.What would you use to calculate for vacancy rates in this situation?