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There will most certainly be a connection to the ABS controller in there somewhere... I just don't know exactly where the tap point would be (not familiar with the wiring in the later trucks).
If you don't have a set of wiring diagrams for your truck, I would strongly suggest getting a set. This should tell you which wire (terminal) on the ABS controller is part of the Brake-On-Off (BOO) circuit (this circuit likely goes into the Cruise Control unit as well to suspend it's operation when the brakes are applied).