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What size are the tires that are on your Trooper right now? 225/60/16's are ~26.5" tires, if you have 245/70/16's on it now you are looking at getting new tires that are ~3" smaller in diameter.

My main concerns, if I were you, would be how much the smaller tires will effect the speedo (~10% error) and what to do if I were to get a flat. I don't think your rear diff will like having that much mismatch when/if the spare were used.
 
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