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For a c10 p-metric tires that meet the vehicles load index are fine. In fact most people believe that the tires largely determine the vehicles load capacity when in fact it is primarily the brake system and suspension that limits load capacity most. Putting lt tires on a stock truck does not increase its load capacity. However, lt tires are tougher, don't flex as much, and are more resistant to punctures.
If Tire Rack don't have what you want you are going to have to find used.http://www.tirerack.com/content/tirerack/desktop/en/homepage.html