Split lock washers do nothing?

We got a drainage ditch overcrossing that if you hit it at 75, you can unload your suspension pretty good and hit the tail end like a relief ramp. Any slower and youll bottom out right at the end of the "table top", bounce and then hit the tail end in the air once again...youll spill your coffee for sure. Aviation is a different dog for sure. I would safety wire my header bolts if there was a way.