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it' s basically a set of wood legs to hold the car up in the normal position, but the ends you want to tip up or the side has a piece of plywood cut in a 1/4 circle, and braced upwards, that way you can lift the opposite side and it'll roll over on that plywood and rest on the upright, holding it on the side. They have a ton of them on youtube.
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I bet a jig similar to that could also be used for tipping bodies right off of frames. I've got some brainstorming to do now.