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Unfortunately this is a design flaw of the brake system on this truck, the park brake system and shoes are so small that if there is any load other than the weight of the truck, they will not hold. I have had to install what is known as a LineLoc on customers trucks, this is a solenoid that is installed in the brake system and is activated when parked to use the 4 wheel brakes to hold the truck and load. hope this helps. Let me know if you need more help or info.
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