How much of that maximum "E" rating will you possibly use? If you want the best ride possible--and the most variety to choose from--shop to your use pattern, or take some pressure off the tires. When my dually needs it, I'm going to keep options open. Supposedly my max load could be pulled by the modern 1/2 ton offerings without issue, so ... I'm going to get fenced in buying for 200% the rating I'll ever require. If you haul heavy regularly or for a living--then get the manufacturer's recommendation... if not, figure out your loads and expand your options. I use tire rack dot com to explore, and have found it usually is about the best deal. I like to see the user ratings, miles driven, and effectiveness to applications.