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My son worked for u-haul for 5 yrs as a route manager (cust svc rep, general issue solver). They are incredibly conservative on their rules. If one guy/car had a problem they thought was awd related, poof, a blanket rule is born. They are definitely not the best source for what you can and can't do. I bet that small trailer would have had stickers saying the max recommended speed is 45mph.