Hay all.
I was poking around my truck yesterday, daydreaming (about all I can afford to do with it right now

)...anyway, I noticed some rust holes just above the windshield on the inside of the cab. The drip rails are uneven on the horizontal surfaces like they're bubblkling out so I think they're rusting from the inside out. Is this a common problem? Am I in for a pile of work to fix this and what kind of options are there.
Many thanks,
Greg