OK... I think that I have the answer... I have a 8x4 wooden board/member. If I place one end of it in the middle of my tailgate, and the other on the ground, it becomes a relatively secure slide for those 152 lbs devices. There is about 10-12" drop from the end of the tailgate to the board, but, I think, I should be able to handle that easily. Lowering that thing to the ground is what is troublesome.