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Phil, can you link to the technical drawing(s) you used to do the frontal area? If we know a major dimension, I can trace them in DataCAD and give you an accurate frontal area, to check your number.
Or, if you use a long (telephoto) lens on a camera and take a frontal picture with a scale (rod or measuring tape) that is on the plane of the highest portion of the truck, then that would be even better. If the lens is about at the center (particularly the side-to-side center) and from as far away as you can manage with the camera and lens you have, then that makes it more accurate.
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