Yup. Turns out it's GVW is 26,000 and GCW = 38,000, right off the ID plate. Washington requires a CDL for single trucks 26,001 and above, or trailers 10,001 and above if the GCW is 26,001 or above. So this truck would not need a CDL. I suppose the GMC 470 series would need one. It's a W454-30, so the wheelbase is 179". I will be calling the guy tomorrow for more details on condition, etc.