Hi, I have a 2012 F150. Last evening I had my utility trailer in tow to pick up some shingles. He loaded the pallet into the trailer with a forklift but while doing so trying to get them on the center of the trailer he was rocking the trailer along with the truck, the truck was moving ahead and back, now I'm wondering if this would hurt the truck, I had it in park and it was parked on gravel . I don't see how it would be a problem but like to make sure. I used it since and don't see any difference in town or highway. Any feedback would be greatly appreciated. Thanks