With the change from 12 valve to 24 valve in the Dodge P/U ISBs the adjustment recommendation went to the higher mileage too. Because of the wide tolerance in the adjustment spec's I'd say 48 months @ low mileage would be too soon, but the adjustment should be front and center if you have any performance issues.
In 9 years of dealing with the Dodge 24 valve before I retired , I think I would have only done a dozen valve adjustments , on the high mileage trucks.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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