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Update: After some internet research and telephone calls I have opted for the Michelin LTX M+S tires. Four tires, balanced, installed with stems comes to CDN$886.12 @ Costco.
We've got those tires on the wife's Exploder and I like them.
They're a little bit louder than the original Firestones but they ride well and are lasting well.
I have always had great experience with TireRack.com. You will be able to read the reviews and ratings of every tire that is available to fit your truck. Even if you choose to purchase the tires elsewhere, the information available is top drawer. Their prices are very competitive.
After a lot of research I put the same thing on my '02 F-150. I don't think you can go wrong with them.
I was very happy with the set we got for free on our 2000 Explorer during the Firestone fiasco.