Doesn’t your Dad mostly haul in dump trucks though?
In the 5 years I was with USF, I guarantee we sent more tractor trailers in those 5 years than your pops has in his life time.
I’m not disagreeing on a simple wind storm… I’m still waiting for how much force you think it takes… I’ve been a part of investigations where trucks went on there side at less than 5MPH, with a partial load, secured. And I can tell you, not much force was needed for a side to lift, shift weight and turn over.