I just had a set of 275/55/20 BFG K02's installed on my Limited on the stock rims last week. They said they had a very difficult time balancing them. This was not done on a Hunter road force balancer, but apparently was still a new machine. So far, it feels pretty solid. Only a slight feeling of vibration around 55-60mph but not enough for me to be too concerned as it's hardly noticeable. I've only put about 100 miles on them by this point, so it's still early on. From what I've read on here, the BFG's are a bit notorious for being difficult to balance in other sizes as well.