In that case I'm not saying the tow could not have caused by the windshield problem since anything is possible in this world but it's difficult to figure out how.
Not trying to shift blame but if the passengers side was jacked up very high then the other side instead of jacking it up in stages to prevent excessive twist I could see it happening as it could be twisted more than any way you could twist it while driving.
Some shops have some great equipment where they can jack a coach off the ground with jacks at all four wheels so you can go high enough to walk under one, these jacks are normally computer controlled so all corners go up at the same rate. Some shops do use a single jack to jack one corner instead of a normal floor jack as it's less physical work but it does have the potential to raise that corner too high. This cause is a guess on my park as obviously I was not there.
I posted a few extra pictures in case others might be interested.
Unfortunately they call them "wreckers" instead of tow trucks because a lot of them in the "good ole days" did just that as part of the normal (so some seemed to think) course of towing cars