Rust and Automobiles

I've had a 2005 Suburban in Mexico for 12 years, mostly garaged. Six years on the Caribbean coast with warm water and a lot of salitre in the air. Two years in Zihuatanajo then back to Playa Del Carmen for 3 years and now in La Paz. No rust, regular washings and occasional waxing. No electrical problems but more than normal tie rods, Pittman arms, ball joints and 3 universal joints. Mexican mechanics keep it running.