I emailed Chrysler and they sent me a build sheet.
2018 Ram 3500 DRW/crew cab/long bed/4x4/4.10 gears pulling a 2017 Spartan 1245 by Prime Time
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I wonder why it won't work? Did you try the VIN decoder that Epat and Simple won put up? It doesn't give all the info the Dodge one does, but it may at least give you some info. If not, you can email Dodge with the VIN and they'll email you the build sheet!