back to the original post you would easily be nudging 3k to do a roof swap by the time you take in labour materials and paint. that of course could easily rise once the original roof is off and you find all the cant rail reinforcements have cancer too....(moisture gets trapped between the roof skin and reinforcements on those beasts and that's where it starts)
as suggested best option is to keep on top of it with localized treatment before it gets to the point where you have no option....
you will never stop rust even putting a new roof on will only keep it at bay as it will start to rust around the new plug welds because unlike the factory we cant dip the vehicle to coat every nook and cranny
the weight and torsion having the roof rack mounted to your roof racks has flexed the drip rail seams and opened them up exposing what you couldn't see before
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