Two questions:
Are you lifting the fronts at the hit?
What are your front and rear suspension packages?
If the front tires are coming up, you may be getting something similar to limiter bounce. Time to put on your high school physics hat.
When the front tires come up, the front suspension drops down. Now remember, every action has an equal but opposite reaction, so when the front suspension "bounces" to a stop, it actually pulls load off of the rear tires.
Switching to lower rate, longer front springs, and front shocks with more travel can help with this kind of unloading.
-Tim
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