Well you are certianly planning ahead. Living in Atlanta we don't have much problem with rust, but two thing that seems to help is wash often and check under your car every so often. I change my own oil and one big benefit is I can see what is going on under my cars. I noticed bolts on the engine oil pan comes loose at around 100,000 miles. I also notice some rust on my bumper area already. I sanded and put rustoleum on it. Here are some links to rust prevention on 4Runners that may help:
http://www.yotatech.com/showthread.p...ust+prevention
http://www.yotatech.com/showthread.p...ust+prevention
http://www.yotatech.com/showthread.p...ust+prevention
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2001 & 2004 Toyota 4Runner SR5 4X2
Both V6 and both Natural White
"Yeah, I like white and I like 4Runners"