Cost and weight. In trucking how much weight you can haul is a prime consideration. Even if it was free, if the contraption weighed 1000 pounds, that’s 1000 pounds less freight you can load in the trailer, and therefore less money you can make for a trip.
When high winds are forecast, I sometimes hear alerts or maybe they are even bans issued about trailers on highways. I assume these alerts are given in Oklahoma too and if so certainly those would have been in effect with those winds. Which begs the question, why were those truckers out on the road in those conditions? At a minimum the highway patrol should be ticketing them.
Edit: I looked online and found many reports of trailer bans that have been issued for high wind conditions. Do only some states do that but not Oklahoma?
High Winds: Travel ban for certain trailers on Turnpike until early Monday
