Rust isn't an issue if you take precautions. But that's really on the previous owners. Mine came from CA/AZ, and I had the underside rhino-lined before it saw its first UT winter. Might not stop everything...but way better than factory after 19 years and no touch-ups. I think I mentioned it before, but I had the frame rails on my other car filled with great-stuff when i did a drivetrain swap. VERY difficult for rust to form/expand when it's sealed virtually airtight with insulating foam.

I'm hoping to get the exterior of mine done like Jo's later this year. That will end the worries about paint.