Plus underneath a vehicle like a truck, you have exhaust to contend with. It's proximity to said exhaust could heat the engine more.
In addition, you would have to engineer a way to get the air to pass through it to cool as a traditional radiator does which could make the airflow under the vehicle more turbulent that it already is perhaps hurting FE.
This is all speculation of course ...
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Thx NoCO2; "The biggest FE mod you can make is to adjust the nut behind the wheel"
I am a precisional instrument of speed and aeromatics
If your knees bent in the opposite direction......what would a chair look like???
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