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You have to understand that while you drive your car on the road at a nice pace with abundant air and usually at short distances, when manufacturers make a car, they engineer them to survive extreme conditions, including 100+ degree weather with full load capacity with the AC on and in stop and go traffic. In order for a car to function with an undertray and survive this and more it would take much more engineering, exotic materials, and money. This is why cars do not come with undertrays, save for the ones that cost north of $100k. I saw a whole story with car engineers about the matter several yeas ago. Heat and longevity are the problems.
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