One problem related to frame rust has been reported for the 2003 Chevrolet Silverado. The most recently reported issues are listed below.
Similar to NHTSA campaign id ea11001, brake lines rusted through on frame behind driver side front wheel. Frame/underside of vehicle is very rusted for vehicle's age/mileage. Chevrolet dealer estimating $2,700 to replace with stainless steel lines. Luckly, no cars/people were in front of truck when brake lines burst and greatly reduced braking power/increased stopping distance.