My frame is rotting away sadly. It ain't too bad now but I don't see the SUV making it over 5+ years w/o needing the frame serviced. Classic rustbelt Ohio where 5 year old cars start to show rust spots on the undercarriage 👍🏼😃When it snows here, I try to wash it 4 times a month - maybe more.My 22 year old 4Runner is rust free... but it never sees salt. Well, unless you count desert dry lakebeds as salt (which is is, but it gets washed off fully after those adventures).
Even then, I still spray a few key areas with Fluid Film.