Mobowhunter, I ran the dicoverers on 2 identical trucks, Both subject to extreme abuse and overloading.
When about 1/2 way through the treads my truck started to sometimes get this wobble, sometimes a bump would cause it or uneven road etc. I thought it was a bent rim but nope. Local mechanic shop who sold us the tires said nah its not the tires its this cheezy GM front end...replaced idler arms(WTF did that have to do with my complaint anyways??) So long story short fathers truck does same thing yada yada yada. Bring tires to get replaced. I guess eventually when these tires see normal abuse from my opinion the steel cords lost their strength and would actually cause the tire not be "circular", more egg shaped I guess. I went back with GY G133's. Heavy sidewall, more agressive tread. Never looked back
I did get good mileage out of them my truck got 25K out of em my fathers truck got 35K.
Wont buy another cooper tire again.
PS they squibble, squat, and are squirrley as hell with a heavy load