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Don't know how accurate the 2010 Trailer Guide from Trailer Guide is but for a GM 3500 DRWs 4x4 is 15,900 and for a GM 3500 SRW 4x4 is 14,800 again this is just a guide. GM also says it 15,900 also, with a 3.73 rear gear, which is the only available options for the Duramax/Allison. The towing weight will increase with the 2 Wheel drive option. GBY.....
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