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A net would be the best option to disperse the load and give complete coverage. Easy for extraction (knife) melt/burn away in fire, if you are concerned with its strength a sfi net would be as good as your belts.
Just like any other part of the cage/car if it bends and stretches it is absorbing and transferring energy.
A butt bar in a sprinter won't stop the rear-end but it does slow it down greatly.
(fyi great way to make nets tight is the soak them then install, will be tight when they dry)
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