Re: Just a reminder
Don't have to worry about saltwater boat launching rusting out our auto's here the winter road salt does a good enough job. My 99 Jeep with 178k on it needs 2 rear calipers, rebuilds are $60 each.
In my experience rear disks are much shorter lived than rear drums, many rear drums can do 100k problem free miles before needing service, rear disks seem to be lucky to hit 50k and the rust and pitting that occurs on some disks is downright sad. The rear disks do look nicer on an opened wheeled auto, like my Mustang.

Buddies 03 Chev 2500HD rear disks gone at 43k, front pads still at 80%, heard stories of 100k or better out of the front disks on like trucks. Odd reversal of brakes life expectancy.
Late model Ford truck backing plates seem to rust out pretty quick, on the Dana 60 front axles anyway.