Hi Trevor
I purchased a post that went into the ground about 6 inches and concreted in. Part of it stuck up a few inches and the main post slipped into it, then a pad lock was put through 2 brackets. this was good as on top of the post was a ball that you puth your tow hitch on. This meens that i had to set the height spot on , so far so good. Where my van is when i take it out i have to pull it out to the left. Its 2 days before Xmas and we are going away, i take out the post and hitch up, left lock on the car and slowly forward, then a sudden jolt and then going nowhere. The chasis on the van was lower that the post in the ground and now the van was jammed on top of the post. managed to reverse of the post then out came the grinder, guess what no more post. Moral here is check where the post will fit and how you take your van out.