Then he numbered each hash mark. He keeps a pad and pen in the hatch near the landing legs button. When unhitching, once he’s raised the trailer to where he can drive the truck out from under it, he jots down the hash mark number that is visible on the leg. Then he drives out, parks, and returns to the trailer and raises or lowers the landing legs as necessary to get the trailer level.
When he hitches up again to leave, he adjusts the trailer height to the exact position where he unhitched. That way, when he gets in the truck to hitch up, he knows the trailer will be at the correct height as he backs the truck up into the hitch pin (and he doesn’t have to get in and out of the truck several times to check and adjust the height of the trailer).
We marked our landing legs at 1.5″ intervals and have not numbered them. There are only 6 hash marks, and I make a mental note of what mark we were at when we unhitched. Frequently, by the time we leave, I’ve forgotten where we were at before we leveled the trailer, but I’ve developed a good eye for knowing how much to raise or lower the rig as Mark backs the truck towards the trailer.
We also marked the centerline of the fifth wheel pin box and pin plate so it is easy for Mark to line up the hitch with the pin box and king pin when he is backing the truck into the trailer.