Like Charlie, I use the memory level from Camping World (can be found elsewhere). The memory level works great when unhooking as well, I set the memory bar on the left edge of the bubble level before lowering the jacks, lower the jacks till the bubble is centered on the memory bar, and now I am at the correct separation height.
I like the idea of using the chain to set the height for hooking up to the rig; I wonder if there is a way to use it for disconnecting as well?
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