What kind of wear is occurring? Feathering? Inside shoulder of tread?
If it's excessive toe as Subarust points out, that would explain the premature tire wear and should have some visible treadwear that appears to have a somewhat-sideways pattern to the wear. In applications for towing, as much as I love my independent suspension, a straight-axle suspension like some of the remaining conventional body-on-frame vehicles with that suspension design are superior for towing due to less worries of alignment being an issue with tire wear for towing applications.
If excessive negative camber is a factor, the inside shoulder of tread will have more wear than the center of tread and/or outside of tread.
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