I don't know where your at, but is doesn't like rust has been a constant companion. I bought my 88 Blazer from Texas, it had been there since new so there has been just about 0% problem in that area. I found some rust in my 2 front fender inner liners, I painted them and had the both installed by my friends body shop. I was lucky as it hadn't gotten to the radiator support. So I dodged the bullet on that one. Truck is a great example of the good years of GM ! Looks fantastic, good luck.