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I vaguely recall some Ford vehicles specified frontal area in the tow rating. Ironic as it was on a forum for molded fiberglass "egg" campers and a Ford lover dinged the spec for not appling to a Scamp with such generous edge radii. Cd missing, yes, and CdA would be better but depending on the tug, which sets up the flow field that trailers follow, it still falls short of the whole picture. My point is complexity of aero. Many (most?) lay folks probably don't understand or care so maybe "why bother" is the conclusion auto manufacturers came to long ago. (shrug)
As for the Axis, it's side profile may help keep bugs off the windscreen and rooftop A/C unit. My GF has a class A (older, boxier) and solar gain while traveling can be a problem. That Axis better have one heckuva dash A/C system and/or excellent glass treatment to reflect the heat rays.
My 2c
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