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Those are great trucks! I've been considering one for my long-haul business because of up to 30 mpg highway.

Assuming you have 2WD, about all you can do is change tires. BF Goodrich and Bridgestone make the best dual-purpose tires. The most aggressive ones will have fantastic traction, yet tend to be noisy and fast-wearing on pavement. I have heard owners of BFG KO's, supposedly a hard-core tire, say they are surprisingly gentle in on-road use.

Suggest you talk to a dealer who is knowledgeable about off-roading to narrow down to which models might be the best compromise for your on-/off-road use.