If the crank pulley is out of alignment, that's usually caused by the harmonic balancer failing (the rubber inserts fail with age).
I'd get a straight edge and make sure the pulleys all line up. If they do, then it's time to also check the tensioners and idlers to make sure you don't have a bad one.
If they don't, check the pulley that DOESN'T line up.
But no, I wouldn't expect the shop to cover towing if the crank pulley is now out of alignment. It could easily have been IN alignment when they installed the belt.
RwP
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