Blue tag is a California assigned vin, usually used on home built and/or kit cars or certain salvaged title vehicles. I have a pickup truck with a ca blue tag. They are also known as special construction vehicles. My registration on that truck lists it as SPCNS.
I don't know a lot about them, but the isuzu diesels seem to be gaining in popularity with the 4bt swaps becoming more expensive and reasonable engines harder to find. The isuzu is supposed to be smoother operating engine and a good engine.
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