If you plan on keeping one of the properties, and they're essentially connected, I'd say keep them both. If one was 2 hours in one direction, and the other was 2 hours in the opposite direction, that would be different. It probably doesn't add too much extra hassle having both.
If you're looking to pay down debt, mathematically it makes the most sense to start with the highest interest rate. What I would recommend would be setting up a 1st position Heloc on your primary, and snowballing the debt from there. You could set that up to 80% LTV, so $200k credit line. Roll in the property with the highest interest rate, and allow all your income to go towards paying that debt down. As soon as there's room on your line, write a check and pay off the other rental from your line. With each property you pay off, it will get to $0 even quicker than the last with the added cash-flow freed up from getting rid of that debt service.
That's the most efficient and cheapest way to get to 3 paid off homes, and you'll retain access to your equity for 30 years on the primary.