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I said power doesn't always dictate cooling needs. It's not a so many HP equals so many Cd kind of thing. Not that max power doesn't influence the cooling needs.
There's still some major differences between the truck and sports car. A truck going up a long mountain pass may be at 100% throttle for 20-30 minutes. The car will likely be cycling between 100% and 0% as it brakes and turns. Also the truck is build for longevity. Some sports cars/race cars may sacrifice race track longevity for speed. NASCAR cars have very tiny radiators, for an example. The sports/race car will also be hitting very high speeds pushing more air through the radiator. The truck may have such a load it can't even maintain the speed limit.
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