Brake Antilock Wheel Speed Sensor problems of the 2003 Chevrolet Silverado 3500

I have a 2003 chevy k3500 silverado truck, with about 60,000 miles. As of December 2010, I have suffered two brake line failures due to corrosion, wherein a steel rigid brake line rusted completely through, resulting in brake loss. I live in ohio, and salt is used on roads, however, in my 30 years of driving, I have never had another vehicle, regardless of age or miles, which suffered a catastrophic failure of the steel brake lines. In both cases of failure, I was lucky in that I was not in a heavy pressure situation, and luckily avoided accidents. I have now largely replaced the entire brake line infrastructure of the truck, at considerable personal time and expense, however, problems still include the fact that corrosion continuously affects the performance of the front wheel speed sensors as they input to the abs system. They constantly fail to sense wheel speed at lower speeds which results in erroneous activation of the abs action. The sensors were replaced once at 30,000 miles, and they lasted about 15,000 miles before going bad again. This compares to a 2004 Toyota sienna minivan which was sold a few months ago at 215,000 miles with zero problems, both with respect to steel brake line integrity as well as abs sensor integrity. I consider the brake system on the 2003 silverado truck to be of very questionable integrity.