Change of plans this thing looks great behind my 60! JK I think you got a great trailer is in great shape for something made in 1967. No real rust, a few dents but it's still water tight ( had about 50 gallons in it) I scrapes about 6 layers of paint of the drain plug.
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Med. duty trucks? the 465 was used in every thing from 1/2 ton to dump trucks even some old school buses. 420 whent away in the late 60s or early 70s and the 465 was its replacement.