I have a 2011 FX4 and am considering a 275/70R18 on stock FX4 rims with either no leveling kit or a 1.5" kit. Only other option is a 295/70R18(34.4tall 11.8wide) or 285/75R18 (34.8tall 11.3wide), both most likely require at least a 2" leveling kit in front and a 3" block in the rear so the truck doesn't look high in the front. How do you like your truck with the 275/70r18? Did you like it better with the leveling kit or without and did you notice any difference in power? I'm afraid I wouldn't like the loss in power with the 34" plus size tires. I drive about 20k miles/year and mostly highway, 60+mph. I like the look of the 295/70r18, but don't think I'd like the way the drive changed. Thanks.