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On my HU, I've just grounded the parking brake wire so it always thinks the car is parked.
If the HU has a USB and AUX from the back the HU, you'll have to integrate that into the existing USB/AUX in the truck. It won't be a direct hook up.
If the HU has a USB and AUX from the back the HU, you'll have to integrate that into the existing USB/AUX in the truck. It won't be a direct hook up.