Hmmmm..not sure what you mean.
Trucks don't squarely fit into the box because of the air they push. Add to that, there are calculators out there that are punishing and those that seem optimistic.
Compare Wallace Racing with RobRobinette, for example. According to Wallace, my own truck would run 11.20s (that would be nice!!) I don't use the Wallace calculator for that reason. Many other vehicles (cars and trucks) generate the same optimistic results, using Wallace.
Regardless, adding 4 or 500 hundred pounds for the calculation normally brings the trucks closer to reality.
What are you trying to figure out?
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