The tire is overloaded because of most of the reasons John stated. The inside dual can't cool as well and in addition the heat from the hub is greater on the inside. The inside dual might be within the load rating stamped on the sidewall but the additional heat from where it is located lowers the acceptable load rating. A 3200 pound rated tire might hold up under only lets say 2500 pounds if it is located where it cannot cool efficiently. On very hot days we used to throw caps off of tires on dual wheel tandem axle trailers that were bumping the limit of the rated load range. A third axle was added to the trailers and throwing caps pretty much went away. Other weird tire wear problems started appearing but that could be solved by changing tires before the disaster hit. The tire problem was mainly on the ditch side because the high center of gravity of the load made the trailer lean toward the ditch. A higher ply tire does not always solve the problem because the thicker tire can't dissipate heat as well.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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