David: That is not a CAR number, it is a DND number. In my experience, some carriers with the pre-1943 DND number were changed to the newer system, some were not. But vehicles that had DND numbers did not change up to CAR numbers, even if they served on into the 60s. By the 70s though, with unification, I believe they all changed to the CFR system. I have a compressor trilaer that was of WW2 vintage and coninued in service right until the late 80s.
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