I think you are thinking about Level-It aluminum wedge levelers and matching chock. All ramp areas have interlocking ridges, nice idea.
I don't think they make them anymore. I have a set and they say Fresno, Calif. on them. I could not find a new source.
They are a bit small however I do use them to level off my single axle rig.
Keep an eye on e-bay...that's where I found my set.
San Diego, CA.
The " TinDen "
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