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Since weight will have a bearing on wear, then I agree if you tow enough the tires will wear faster than not. I don't tow very often and driving without towing and my rotation frequency, probably means my heavier front end wears out the tires more than the rear. FAW = 4800, RAW = 3320. And when towing FAW = 4880, RAW = 6280. As you can see the rear almost doubles and the tires in the rear would wear more than the front when towing.
So I guess the answer to dpam's question is that the tires will wear the fastest when they are carrying more individual weight. Towing, loading or cruising - will depend on the load at each tire. In the case of Duallies, it would also be the same especially since dually rear ends can even carry more weight than SRW, but the weight is divided between four tires versus only two.
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