Woah, i got me some Yohkama's A520, wow, those are the sorriest peices of crap i have ever had. i have cambrage in the front cuase of my drop (9 in the front, is that alot? )
but after only 1 month, i was hitting metal on the tire. now i drove with the cambrage on my general's and they lasted for 6 months before i ever got new rims. now i got those and they suck the monkey *****. i dont recommend those to even my worse enemy and i hope you all stay away from them. they are also like playdoh and you 2 slight burnouts and you will be missing your rear tires too.

 

I have the yoko a520s on my one car. They have 20,000 miles on them and still have a reasonable amount of tread left. I have 245/45/VR16s on the back and 225/50VR16s on the front. It sounds like your truck is the problem and not so much the tires.

kev