general problems of the 1998 GMC Suburban

The tires that failed the first time had been replaced with the same firestone steeltex at tires. These new tires are a year old and already are falling apart and all cracked. I want firestone to recall these tires before I get into another accident. (tiresize: 16)( dot number: tire size: 16 ).

When making any kind of turn between 90 degrees or smaller the front wheels lock up. Dealer stated that this was normal condition when driving in 4- wheel drive. Owner was driving in 2- wheel drive at the time. The Suburban is being repaired by dealership. Steering repaired, but vehicle still vibrates while driving on highway, dealer says that it is because tires need to be replaced. Owner believes tires should last longer than 21,000 miles.