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Those are very heavy tires. A 37" version of them will beat the shit out of your shocks, bushings and bearings. If you plan to keep it long term, I wouldn't do it. If you are going to buy a new truck in 4 years, **** it- put em on.
The C rated OEM KO2 probably weighs 61 pounds vs. 78 & 84 for the 37x12.5 and 37x13.5 Toyo RTs, respectively.
The MTs are even heavier.