Of course, you want to go with a turnkey provider (if that's the route you go) that keeps annual maintenance costs as low as possible, but there will always be something big that needs a repair when it comes to a long-term investment like that.

I'm not sure how long the tax rate will stay low. 

I can see also why your choosing to do flips in that area as price points are low for San Diego.

Interest rates are super low finance the crap out of student debt!

If i separate heat, can i ask protected tenants to start paying their heating bill?

Cash flow is generally very thin due to the cost of maintaining low quality materials, paying lot rent and dealing with bottom of the barrel tenants. 

Property taxes in Cali are very low as compared nationally still. 

I have seen a few parks  empty halfway during the summer time "I am a mailman" That being said there is a market for these homes but the lot rent is going to add up quickly unless you can sell fast and buy at a low cost.

I did some investigation and it seems like a pretty good cash flow scenario with low overhead.  

Anything one can do to get a more targeted list when low on funds is a smart play if the time investment isn't too great per property.