I haven't found anything on this using the search feature, so...

I just noticed that the sidewalls on my BFG AT KOs are distorted, i.e. wavy and bumpy. Checking around I see that this is not unusual for light truck tires, but not found universally either. Mine appear to be the most extreme example but you can only scrutinize so many tires in parking lots.

I just had them rebalanced and rotated and the techs made no comment. They washed them which is how I noticed in the first place. Yes, they have been used hard. I don't rock crawl but I do jeep trails and unmaintained roads. I encounter a lot of washboarding, ruts and potholes on the latter. The tires are are 2-3 years old (not sure).

Has anybody else experienced or seen this and if so, any comments? I want to hear something from this forum before I hear something from a tire saleperson.