yep
Whizzo is partially correct, but the more significant reason is the tire diameter has an effect on the overall drive ratio. A larger size tire defeats the value of the lower rear end ratio of the Tundra which is 4.30 and one of the reasons it has a relatively high maximum tow rating for a 1/2 ton. Go with the 18".
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Travel is in my blood, adventure is my passport, aluminum is my favorite construction medium, and therefore, an Airstream was my destiny.
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