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I don't know of any of the national or regional rental companies that have crew cabs anymore. Even the commercial fleet rentals don't seem to have any crew cabs. The best bet to find one would be through the industrial rental/leasing component like United Rentals, Hertz Equipment Rentals, and other contractor service companies. The last one I was able to rent was just over a year ago and it was a 20' crew cab box truck through United Rentals.