You can get a HELOC if there is equity in the property most likely, which there should be since you own it in cash, but you will just be decreasing your pay out and then may end up short in repair money, depending on how much it is worth.

I have extensive experience there doing about 500 deals , thousands of repairs/ renovations and move in and outsAll the best 

This could be very difficult if you are going to self-manage, as you will be turning units every year and dealing with a lot of repairs.

Look into FHA 203(k) loans for repairs and down payment assistance programs in your area.

Let me know if you have any questions around financing- I’d be happy to assist!

Today it has doubled in value with only about $75,000 in repair money.

One of our parks is 60% POH and in my experience the only way that park pencils as well as it does is to get through all the major repairs, get the homes 'right' and then keep them 'right'. 

It's an estimated cash on cash return given current rental rates subtract expenses assuming 7% interest rate, 10% management fee, 5% repairs, 5% capex and other expenses like mortgage, insurance, tax. it's a estimate to tell you what properties to analyze vs ignoreyou can see the are pockets of negative returns as well as pockets of positive return. this is to supplement the data @Devin Conley provided

How about repairs ?  

Getting Fair deals on labor and repairs comes from developing win/win relationships with contractors.