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Honestly, pop off the tailgate and sand the shit of that bottom recessed inch or so (where im assuming the rust is)
Mask it off, and hit it with truck bed coating. Done that on 3-4 Dodge trucks.
Did this the other day, will post a pic of how it came out.
My first time playing with Bondo (cut out the rust, sanded everything, hit it all with chemical rust converter, then bed-lined it).
I fucked up the bed liner a bit in a spot, but the bondo job I did on the tailgate is completely hidden from looking at it.