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Im not sure if it is possible to answer you question to your satisfaction. But I will try to give you some advice. You could try to install a block on the brake pedal wich would raise the height of the pedal, Allowing you to press the brake pedal at a higher position, Away from the gas pedal. But, If you were my best freind in the wolrd, This is the advice I would give you, Sell this truck, And Buy a vehicle that fitts your feet and Driving style better.
Good Luck, Mike