Anyone had trouble balancing Good Year GSA 31 X 10.5 tires? I had a set put on a 1999 Frontier SE V6 King Cab. The rims are the stock 15 X 7's. There is a minor vibration in the 50 - 60 mph range that I can't get balanced out. I'm begining to think it is the tires and was wondering if anyone else has had trouble with this brand of tire or has any advice.