Taller tires change the effective final gear ratio between the engine and the road. Bigger tires will mean more rotating mass which effects you as described on your truck ('cept for the noise perhaps). It will also make your speedo read low.
Shorter tires will help your acceleration, and your fuel mileage because the freeway rpms will be higher. Also your speedo will read high.
In general, I'd try to match the stock size in outside diameter, just for speedo accuracy alone. Or lean towards the short side.
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