That's my train of thought also. The Powerwagon had a Hemi and I think that's the only difference. I'm not sure if the hemi had a 48re transmission.
Last week I purchased the 7yr 85000 mile Chrysler warranty and noticed in the fine print any alterations could void the warranty. I had 285's put on 10000 miles ago and had the computer reflashed to reflect 285 70 17 by the dealer on the tire change so they do have a record of it in their computer system. I don't think they would try to pull that on me but you never know.
Our local dealer sells may new Dodges with bigger rims and tires.
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