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build a steep jump with a short gap after it, then place the car pretty high, so its kind of a step-up, then the riders can hit the jump, make a 180 and then just turn on on the other side of the car where a small landing hill is prepared.
the jump is built so that you land on the car pretty soft and then you just use the momentum of the jump to reach the landing hill
i cant describe it very good, but the thing i mean is often seen in bmx/dirtbike vids, where they just tap something and then go for another 180.