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If you look at semi-trucks you will notice that they are moving to single instead of dual wheels per axle, this is for fuel savings, apparently a single wide tire is more efficient, at the same time I think you can get small size heavy truck tires that run at 100-120psi and have a much longer wear life then your current tires, they also have a lower rolling resistance and are designed for a heavier load so switching to a single rear on either side would still allow you to haul your 2000+ pounds in the bed of the truck and get rid of the fender flairs.
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