Blue,green, purple, I can't keep it straight. I see pup sets, one pup, and one pup and a dolly. What I do know is that the tractors pulling the pups are marked FedEx.I don't recall ever seeing a non FedEx tractor pulling FedEx pups. Do you have contractors driving Fedex identified tractors, if not, then these are FedEx drivers. If your trucks are governed to 65 then my Volvo must be slower than I thought but it sure is comfy.