What tires are you running now - are they LT (light truck) or P-Metric (passenger car) - AT tread are available in both? If you're currently running P-metric, then any LT tire will have stronger sidewalls. If you're already running LTs then you may need to look at the load rating, but things can become tricky, the higher the load rating, the stronger the sidewall, but, that strength comes at a price, increased cost, increased weight and increased stiffness.