I would look for gears to keep the RPMs about 1500+ on your engine. My 5.9 will pull good above that and does quite well at 1600rpm. I get up to 14.5 mpg towing my fiver at that rpm.
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For now 1996 Dodge Ram 5.9 Cummins 365HP 830TQ pulling a 2006 28' Dutchmen Fifthwheel and at times a 16' boat behind that!
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