What is the condition of the home and trailers? 

Look up Pace Morby and his groups, etc, they sometimes source homes that don't have as high of an entry fee as buying a home the normal way would. 

can someone point to any insurance company offering insurance for California multi family homes that are 5+ units and built in 1950sThanks 

Worth looking for small multifamily or single family homes with an ADU - or easy potential to convert

I already have my first multi family home in NJ and I would like to know how good it is to invest in St.

Use Zillow and rentometer.com to get data and analyze a few from your home to see what type if returns there are.If these meet your investment criteria then start looking in person.

Investment Info:Mobile home hard money loan investment.

There are other modular homes in the area, but there is no info about them selling on the MLS to use as comps, I'm assuming this is because they were just purchased as a lot and placed a modular home on it.

Go to Home Depot and ask about the bid room program.  

My theory is it's much easier, emotionally, to walk away from a rental than it is to sell your home (home owners are more likely in for the long haul).