San Diego SFH rad average rent increase of $600/month last year (source Core Logic).  

When you mentioned that you don't have a lot of money to start with, I'd recommend focusing on increasing your current income and decreasing expenses.

Are mobile homes more prone to these issues than a typical SFH and I sure increase those allotments? 

The shorter the prepayment term has an impact on increasing the rate.4.

Investors focus on adding Accessory Dwelling Units (ADUs) to increase income streams.

Since you know who you want to serve, try to tailor your listing to make it easy for them to say, "yes".General advice: MTRs are attactive to a lot of people because of the increased cash flow, but it's the appreciation over time that really generates wealth in real estate.

I'd start by looking at where the money is going and how to increase your income and lower your spending. 

I've already renovated one of the bathrooms, and I’m planning to paint the interior, update the kitchen cabinets, possibly sand the wood floors, build a fence is a corner lot and increase the rent for the room since my tenant is currently renting the entire 3-bedroom, 2-bathroom house for $800 a month.

Still renting and value keep increasing Lessons learned?

Alternatively, can you use either unit as an STR to increase cash flow even further?