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On a half-ton truck I'd avoid high load index tires (Load Range E). Stick with original size range as well, but in an LT designation.
The trade-off between LRR truck tires -- let's designate closed shoulder "highway rib" tires as such in the interim -- and traction tires needs to be cleared up by the OP as to whether low-traction but high miles/high mpg tires are a good choice.
With so few miles to accummulate over seven years (projected tire life) I don't think this is going to matter in any significant way.
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