Can it be done safely?

I have a 2015 Ford Flex and tow an AR-One 15RB. We picked it up while traveling up north and towed it about 300 miles before installing a WD hitch with sway control. The vehicle sagged to much in the rear and wandered a bit more than I liked. I purchased a Pro-Series WD with sway control for $256.00 , installed it and then drove 2000 miles back to the house. The PS hitch did a great job in leveling out the Flex and the manual sway control is more than sufficient. It does groan a bit a low speeds on tight corners but this is barely worth mentioning. The Flex's mileage at 62 mph dropped by 55% to around 9 mpg because of the frontal area of the trailer and the head winds. The last short trip it only dropped about 35% because there was no wind to speak of. With a smaller engine be prepared for a pretty big mileage hit.
Randy