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I actually like the idea, but modern ambulances typically ride like a lightly loaded medium duty cargo truck. (Which is basically what they are.) The old hearse style ambulances rode like a Cadillac, because Cadillac built them. ;-)
Cool idea, but I'm a bit paranoid when it comes to planers cause I've seen what happens when one throws a blade. I'd come up with a way to feed it from the side, so that if it ever happens you're out of the path of a thrown blade.