I don’t have any other hesitation other than the total income they receive from their jobs not being sufficient (at least 2.5x the monthly rent), but should I consider the six months advance rental payments knowing they will have access to additional income made from the sell of their home?

They can allow you to access markets outside of your own, which can be invaluable.

There's no way I'd own more than a couple of houses without it, as the ability to leverage would be so limited that only the cream of the cream would have access to those funds.

Sorry for the one paragraph, I had spaces in my post, not sure where they went.

I would assume a 50% expense ratio because your lot rent is still below $300 mark and the % to run a smaller park is very comparable on a per lot basis up until the 75-100 space mark and/or you have over $400 in lot rent.are you going to manage this thing your self? 

The purchase price is 399k.I am working with a partner and we have access to 150k, but not 400k.

You can look for someone who specializes in selling that product but they will most likely be a Farmers or Nationwide agent that has access to quote with those carriers. 

The old stuff looks clean and not dreadful, and is in neutral colors, but isn't that nice (e.g. the cabinets are kind of rickety and the DW/fridge don't really fit all that well into the space made for them, the floors aren't missing pieces, but also are a bit uneven in places).  

Go buy a space heater for each room of the house including basement or crawl space .  

Can anyone recommend a low cost brokerage in Massachusetts where he can renew his license and maintain MLS access?