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Tying down a tractor trailer, especially solidly enough to keep this from happening, is probably asking a bit much of the drivers, especially those who won't even bother to kick the tires before firing it up and wheeling it out onto the highway.
We tend to park in groups because we have to... especially east of the Mississippi, parking is kind of a precious commodity.
We tie down airplanes all the time, but for obvious reasons, we're a lot more apt to be careful with those.
How about a set of "blow out" panels in the fairings? Secure them against the sort of pressure they'd see going down the road, but if a rogue crosswind hit the rig, the panels (hinged and secured with magnets or the like) would release at a certain point, allowing some of the air through. Or, avoiding moving parts, a set of finned vents might relieve some of that pressure without sacrificing the aero advantages of the fairing.
And, yeah... the moment arm at the top of the trailer is FAR more likely to generate the roll force needed to take it over, but every little bit can help, especially if the lack of relief at the bottom increases overall pressure against the side of the trailer.
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