Your math is off a bit, the tires you pointed out have a single rating of 3195 lbs. The Michelin that have been used for years have a 2680 lbs rating. A simple rounding and subtraction 3200 - 2700 = 500lbs per tire.The ratings when used in dual configuration are lower, but should be proportional. Again in round numbers, 4 Michelin as duals have a load capacity of 9,000 lbs or 600lbs lower than the suspension/axle itself is rated (9,600 lbs). That could be a consideration if you are close to max axle capacity. The Nexen's don't show their dual load rating, but I an sure it would be higher than 9,600 lbs but in any event you should never use all the higher load carrying capacity in the tires, so you should take that into consideration. But yes, higher load capacity in the Nexen's can be used and is an advantage. Just remember, it is just plain unsafe to overload tires and/or the axle.