general problems of the 1999 GMC Sierra

Pirelli scorpion tires, size p255/70r16, bought 7/11/2007 from tirerack. Com. At 21,000 miles, tires are showing severe weather cracking, very similar to what I experienced with my Ford explorer during the firestone tire recall in 2000. Tire racks warranty specifically states tires with weather cracking which were purchased more than 4 years prior to presentation for adjustment are not covered by the warranty. Although there is ample tread life left, these tires are simply no longer safe.

Plastic hub nuts continually become loose and have to be retightned. While driving about 55 miles per hour 0ne actually came off.