My experience with the King jack on my class1 is why I replaced it with a real floor jack. The King works ok on flat surfaces with Ideal conditions what limits it is the need for a bung (receiver) for the king to go in on all 4 corners it may not be located where you need it in race conditions. If I kept the King I would of needed a scissor jack when the car was sitting on the ground or buried in sand. A floor jack doesn’t have limits a screw jack dose. Thanks Curt LuDuc for your swap meet so I could unload it to the next guy.