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What is your GVWR? What is your GRAWR? A 17.5k empty (prob higher than that--ask Cummins--) is going to gross 21K? A 21k gross will have a pin weight above 4.2k, and will be a lot on that rear axle.
You need more weight figures to work with...
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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