My Tahoe was starting to develop rust on the inside of the door panels when I lived in Michigan before moving to Central Oregon in 2003. Here they use cinders on the roads instead of salt and the rust completely stopped advancing. That rig is still running today!
The Midwest is terribly unkind to vehicles. This was a perfectly functional fuel pump on a GM pickup truck however it developed a pinhole fuel leak due to corrosion where the pressure (output) side of the fuel line connects....it's almost like these were engineered to collect moisture and road salt. Anyhow, pump was replaced and generously coated with a rust inhibitor product called "fluid film" that I have used for years especially on equipment like snow plows. Just be aware it does not fully dry so if you ever have to come in contact with it, you will be wearing it. But it does what it's supposed to..
Check this out! https://a.co/d/8PGpWny
Discussion
For sure, those things will go forever if you want... I got 315k out of my last Silverado, a 2000. Not much left of the body tho. I'll take cinders over salt any day