Oversize drivers and pilots overwhelming use CB for communication. UHF for the oversize industry is mostly used by companies that have their own in how pilot vehicles. Also very common with Canadians. I've used Canadian pilots a few times and they would usually give me one of their hand held UHF radios because it has better range than CB.
4 trucks and 12 pilots on this project at the same time. All 16 vehicles using CB. Mine is the one on the right that doesn't match the rest.
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A lot of drivers including me don't just ride around with the CB on any more but most owner operators and smaller companies absolutely still have and use them. It's the big fleets that don't have them as well as the foreign drivers that can't speak English very good anyways.
I've been escorted by local and state police with some bigger loads and the cops who do those escort jobs also tend to have CB.