The frontal area is looking at the truck with the trailer hooked to it and count all the area that you see truck and that portion of the trailer which can bee seen (= do not count the portion of trailer that is hiding behind the truck). Do not count the air space between the tires but do count any portion of the trailer that occupies any of that space between the pickups tires that is lower than the bottom of the truck. Note if the trailer tires are "hiding" behind the trucks tires you do not count any of the trailers tires but do count the portion that can be seen. (Ideally the trailer will be completely behind the truck and will not add anything to the "exposed frontal area"! Note if your dog is hanging his head out the window you should count it"I'm still unclear on if that is 20sqft of frontal area above the cab of the truck, the bed of the truck, or just total of 20sqft of frontal space.
The other thing I am unclear on is if that requirement is for a flat frontal space. Obviously something like the prolite has a very aerodynamic teardrop front, which would be much more stable than a flat front slab of a trailer.
Sponsored