sharp edges are bad for physics engines, i don’t want to repeat myself but there shouldn’t be that kind of spikes on a terrain in the first place.
you can increase vehicle body inertia or per body velocity calculation iterations to get better reactions but it will not be a solution.
may be you can try some settings from the engine, for ex. if i set “Bounce Threshold Velocity” (in Project Settings->Physics) to 2000 then the collision response feels much better.