281-22 is a 1951 GMC series 280, 137 WB and has chassis serial No. range of 1001-1844. 228 motor. P is probably Pontiac MI.
I think it is a 1 Ton.
The 3100, 3600 and 235 motor are all Chevy talk. You have a GMC.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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