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I agree entirely. I have the KO2 tyres and they were horrible at cruising speed for the first 3k miles and are now fine having worn in and reduced pressures to 37. I tried a dealer car with Bridgestones and they are much better on the road.
None of this should surprise us. When we buy a normal 4wd with OEM road biased tyres and switch to ATs we accept that we are making a big compromise. The difference with the Grenadier is we start with ATs and forget we have made that compromise up front and judge the car unfairly as a result.
Yesterday I drove a Grenadier on the highway up and down a 10,000 foot pass on brand new BFG KO2 tires. Literally - one finger steering. There was maybe a one centimeter "dead zone" or one centimeter of play in the steering wheel at dead center when going straight. That is pretty damn good for a vehicle on solid front axles, with recirculating ball steering, and with kingpin knuckles.
I have never felt there was much in the way of on-road compromise with BFG KO2 tires. We've owned four sets on three vehicles and the on-road performance is excellent. I've never known them to need a break-in period. Maybe it was your air pressure?
Sure, the Bridgestones will be a little smoother on the road, but the KO2 is one of the best on-road driving AT tires you can buy. Your truck should be running great on the KO2s. It sounds like you've run ATs before. What vehicle are you coming from?