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There are a few issues:
1. On the track, keeping temperatures in check absolutely is a big deal.
Aftermarket radiators, oilcoolers and so on are very popular modifications for a reason.
And trackdays in summer are absolute hell for the cooling system.
And no, you can't just run it any hotter or you risk blowing up your engine rather quickly.
2. The truck usualy doesn't run at maximum rpm and usualy not quite at WOT, the car on the track does.
3. NASCAR style oval "racing" isn't hard at all on the cooling system, in fact it's so easy on the cooling system due to the high airspeed, they run partial grillblocks.
Going in a straight line at topspeed allows for maximum airflow through the radiators.
On the track, you're at WOT and high in the rev range most of the time. Braking zones are short and you're back on the throttle right after hitting the apex.
Most road vehicles don't realy do well in such situations and overheat, leading to the driver having to take slow cool down laps.
Anyway, my point was:
High cooling air requirement means larger air intakes.
Flaps certainly do help, but even when they are fully closed, you still have additional drag.
The solution are variable crossection air intakes.
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