You never tune a stadium truck or buggy to absorb jumps, ever, they are designed such that the car will bottom out, and all of the force is absorbed by the chassis, NOT the suspension, this will not hurt your car, its how its designed.
I disagree with this statement. It is more accurate to tune your truck or buggy to the majority of the track. If there are a lot of jumps, you need to tune your vehicle to it.
Also, the chassis may be designed to bottom out and not take severe damage, but this is a very inconsistent way to race. When the chassis bottoms out and slaps the ground, you lose traction and can cause a very unpredictable situation and spin outs. This can make the difference between winning or losing.
I am not advocating tuning your vehicle because of one big jump, but if you have many big jumps where your chassis bottoms out, tune your suspension to absorb them.