When your shocks are mounted on the truck, they should not be fully extended once they are settled. Otherwise, you will have not have any play to allow the shock to extend for when it hits hole in the track. Shocks work in both directions. They dampen bumps, but they also extend when necessary to cover the holes.
If your ride height is to low add spacers to increase the ride height. This has been mentioned by several people in previous posts.
Also make sure that your shocks have the proper amount of oil. Remove the spring, and verify that when fully compressed the shock rebounds slightly. (The amount is up to you, but I prefer to have barely any rebound since that's how Charlie Perez builds his shocks.)
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