Some lowbed semi-trailers have a height adjustable gooseneck/ hitch, to raise or lower the trailer front end. On level grounds, lowbed trailer trucks with heavy loads, keep the minimum of ground clearance to maintain a low center of gravity. Before crossing train ramps, they raise the trailer front end. The tractor driver in the video, needed a manual height adjustable receiver hitch. He should have raised the front end of the trailer before crossing the ramp.