buy heaps of fish oil and spray in all inside of the internal pannels, doors, tail gate sliding door etc. you have to pull the trim panels off but i wont rust, my dad was a auto spraypainter and used to use it on all of our 4x4's none ever rusted, and we used them on the beach regularly, i used it on my 4x4 too, only rusted 12 months ofter it rolled into the local lake

, but that was the least of my worries, i use the boat carpet in my van too, great stuff.