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Re: Wheel sizes and hub spacers for '73-'87 P/U
Sounds like a previous owner of the trailer or PU(while it was still a PU), swapped rear ends. One big advantage of these trucks is the wide range of parts that can be swapped in. One big disadvantage is the wide range of parts a previous owner can have swapped in and not documented.
The PO might have wanted the rear end originally on the bed for another project and just bolted on a random axle and sold the leftovers as a trailer. Might not even be a GM axle.
As you have noted, 5 or 8 lugs is the normal Chevy number for the years in question.
Before buying new adapter spacers and wheels, might price a used axle assembly from a salvage yard or ask for one on CL.
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