You need to find a woolwax undercoater. Its a wet undercoating that prevents rust. Its not a one and done thing but doesn't trap the corroison or rust like hard coating. Do some research on woolwax and you'll see really quickly the benefits.
Yes the salt can and will eventually rust out everything. Frames, springs, body, wiring. You name it.
Post up a couple picture of the trucks snd areas you’re concerned about.
We spray vehicles up here with oil, every has their favourite oils or rust inhibitors. Big shops here do it in less than an hour, the get under it, pressure wash it, and spray it with big spray guns. Personally, I wash my trucks out my self, let it dry out several days, and then spray it down - every thing and everywhere, inside and out, top to bottom, with a couple of differnt rust inhibitors every year.
i don't know if you have the ability to since road salt comes with freezing weather, but whenever we have some spread and it warms up, or after a trip on the beach, i put a garden sprinkler under the truck for a bit
i have always washed my truck when i get the chance. that and i put a good wax coating on the outside and door frames. there are aton of rust preventers to be put on and the guys in the U.P do love using the wet spray on methods
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