We have a 2013 Subaru Outback with Class III hitch, 2" ball. We are looking at purchasing a popup after not owning one for many years. The Popup we're looking at is the Rockwood Freedom, model 1940 LTD. There is an option to get electric brakes on the camper which has a dry weight of approx, 1,500 lbs. Do we need electric brakes? And if we do decide to get the electric brakes on the popup, do we have to do anything to the Outback? Please advise.