i have a 25 foot toy box that weighs 5000 dry and fully loaded about 7800 lbs. i do have a wd hitch that came with the deal from a private seller. i have noticed at time going around corners that the "splip" light comes and the mada applies brakes to the gripping tire inorder to maintain control. what could be causing this problem?is it that the hitch and wd are not set up at he proper hieght? proper weight distribuition in the trailer? any help would be great.