jm,
Your tire wear problem might be an issue of worn bushings/connectors, worn shocks, and/or worn springs. Those suspension components/steering components do need to be changed every once in a while. I changed the shocks on my Taurus at 100,000 miles after replacing two tires at 75,000 and the other two tires at 80,000, and I am now at 168,000 with a decent amount of tread left on those tires.
Of course, I left off the obvious. The van might need a wheel alignment. I get one done every 3 or 4 years, or whenever I think the tires are wearing incorrectly.
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