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These vehicles are considered high speed, high load vehicles.

In very high load applications up to 50% with gear oil can be used in applications such as gravel trucks, very high load semis and concrete haulers.

Either Oil Supplement or Gear Oil Additive can be used, but EP is recommended in high speed gear boxes.

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PA300 Oil Supplement Gallon 5 Gallon Bucket of Power Punch
Power Punch Oil Supplement in Plastic Gallon Jug.  Beats wear, friction and heat.  Increases power and mileage.  Save money and drive farther. 5 Gallons of Power Punch Oil Supplements in a plastic pail.  Beats wear, heat and friction. Increases power and mileage.