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I would not narrow the tread width. Trucks need all the help they can get . . and resistance to side forces is crucial.
70-series is the default size these days, IIRC. A good trade-off in dry/wet weather braking/handling where FE is not compromised.
The minimum width is where the tread width is no narrower than the wheel rim width. I also would'nt go wider on the tire without a matching rim.
Stock tire sizing with plenty of sidewall height is always a good truck tire. I don[t know whqt the low profile tires are good for on a truck, but I'd be concerned for normal truck duty of being loaded and hitting potholes, curbs, etc. (I can say I won't, but one often has no choice with some trailed loads, some roads, etc.).
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