I am single and can save around $4000 each month. 

Local PM also charges a first/ half months rent which I beleive Hemlane do not charge ? 

The cost of housing has exploded. 

Not familiar with it, but as with most HELOCs, the analysis would come down to the cost of capital vs the ROI you think you can get on spending your home equity.

You can charge a hefty premium because with the shop fully equipped the operator saves the cost of outfitting the shop and the time and effort required.

Do you do it in batches once a month?

If you need them, the money is there.Even if you get the house ready, how will you respond to maintenance requests or other issues when you are on the boat for a month at a time?

My new bank requires that requires that I have a positive balance of 2 months escrow payments in my account at all times, meaning my account is a few thousand dollars "behind" on this balance.

@Miguelli Fernandezif you buy something with 100% borrowed money, you will likely be cash flow negative every month. 

I don't personally have any properties in Summerville, but I've run financing for a few investors in the last two months in the area and am happy to chat about what we're seeing.