I have felt your pain. I personally do not have this problem with my 2007 as it is stored indoors during nasty Chicago winters. BUT our old motor home
HERE was so small it was our second car for it's first 5 years. We drove it year round back then so it seen a good amount of salty winter driving. The RV hardware got all messed up from the salt very quickly, just like you are showing. I had a very hard time maintaining it. I found a very good waxing in the fall on all that hardware helped a lot. I also visited those do-it-yourself car washes a lot, just to rinse off the salt spray. As others have shared, I did replace all the hardware I could, with stainless which helped a whole lot in general appearance.
That corrosion problem is one big reason why our trips with our PC to date are done in spring/summer/fall. And remembering the hardware corrosion trouble (and little water leaks from such screw holes) with my old motor home, I told PC-USA to leave the roof rack and ladder off, just placing them inside the RV in pieces. So that stuff is stored at home, maybe of value to the person I one day sell the motor home to.
What worries me more with corrosion, is all the hidden stuff under the chassis. There is all kinds of wiring, fittings, etc, etc, that I think will get messed up much worse than the spare tire handle.
