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They’re in no way illegal. That’s flat funny.
Truck regulation is basically road restrictions. Think turns and curves where rear overhang intrudes into other lanes. Rare; mainly mountain roads. These roads, but not those; etc. That “takes care of” OAL limits.
And they work well. I had a slight tailwind out of Amarillo yesterday at 79,300-lbs. Stayed above 10-mpg with skirt & tails almost all the way to OKC at 67-mph.
This morning when I finish this I have to pull the tractor out from under the 59k trailer to re-grease 5th wheel. Had to initially shove my way under. Fighting any crosswind, road camber changes, ruts, etc, gets old.
Will buy fuel and then also move trailer tandem axles forward slightly and also move the 5th wheel itself. End result will be FAR fewer steering inputs and/or degree & duration thereof.
Mechanical condition always trumps aero. One has to set the conditions for it’s performance addition
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