Why don't RV makers list frontal areas?

[Boomerweps]

Really. It's a major towing consideration that the makers do not list on their spec sheet listings. As we all know from towing, it can make a huge difference in the towing experience. It's not like it's rocket science. Yup, height of the box by width, but for the consumer, all the crap on the roof is an estimate. Going list height by width doesn't address the open area under the trailer.
Another thing not commonly listed is height clearance to the frame and/or lowest item, like the black pipe, when level.