It's good to know that no one has ever filed a claim with one blowing over!
There have been instances of them blowing over from strong gusts while driving along the Interstate here in Kansas. Sustained winds are not the problem, gusts are. Almost every year some semi-trailers are blown over and not unusual to read of railroad cars being blown off of the track.
The most recent newer trailers travel trailers and also 5th wheels have a much higher profile than the older ones. Same for the newer motorhomes they all seem to be quite tall.
Jacks, stands, or frame blocks would keep a unit from rocking so that the gusts wouldn't be as hard to withstand.
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Unrelated and thread drift but still about wind damage--Friends in the 1970s purchased a double wide mobile home and where having it moved by a company to the city where it would be parked. It became quite windy and as usual the KS State Highway Patrol stopped them and made them halt the move. The movers unhooked the tow rigs in order to go back home. You guessed it, the parked units were blown over by the wind.
Of course my friends were left without the unit, their banker wanted paid, the insurance company said the units were in transit and are not covered by the homeowners policy. The towing company said nope, not in transit as we were not connected and they were parked as per KSHP orders.
I never did learn the final outcome as to who was deemed responsible.