Yes, it is interesting. I have seen some super rusted out stuff, but never seen a rusted out roof, except for on the web. Wheel wells, fenders, rockers, body cross members, yes.All 3 of my R/C and a shortbed I used to have are New Jersey trucks and have been outdoors and in snow/salt most of their life and have no evidence of rust. Not sure how or why some rust like that. I did have a pickup that had more rot than metal though. A while back I cut the front roof section off an R/C that I scrapped that had zero rust in that area. Go figure.