I have a 17.56-1, 2014 model with the extended draw bar, towed by the 3l Diesel Patrol. I have a 2 inch left in the patrol, with heavy duty springs to assist with the weight of towing the van when car is packed too. I was told its in my best interest to still use the weight distribution system, even with ESC. I have it set up so that when the weight distribution is on the rear of the car drops 2mm. I am unsure about any weight gain on the ball at this point.