I have a 16 foot boat I pull with my bonnie. I bought a trans cooler but haven't installed it yet. I have had no problems at all, and the boat and trailer are about 1200 pounds. Only one thing I would like is to be able to manually adjust the rear end a little higher. The auto levelling suspension leaves it a little (an inch or two) lower than normal ride hight. One other thing, you have to be careful of brake fade. It is noticeable, so don't get caught with your guard down.