Ok, I need some help here. I needed tires for my daughter's car, so I decided to go ahead and work a deal for truck tires at the same time. I went with Discount Tires brand, all terrian in a 285. With the 1st set the back end wallowed around so much I thought I had a flat. I had Discount put new rear tires on. It is better, but still wallower's around quite a bit. Do you think the tires will get better with miles, or should I buck up and spend more money on better tires. If I do, should I get the Goodrich All Terrians in 285's, or the Michelin's M/S in 265's. I had fully intended to get Michelin 265's, but I wanted the A/T, and they're only 6 ply. Only the M/S, and other less agressive treads are 10 plys.