Re: dually tub trim whats under it
I believe what he is saying is about the trim. And yes there is holes underneath. On the bedsides you would need to weld the holes shut and on the dually fenders you could either use filler or fiberglass on those.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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