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penta, the "right" rear end depends on a lot of factors. My '17 RAM 3500 4x4 cummins diesel has 900 lb/ft of torque and it has a 3.42 rear-end. It has no problem moving my 14,000 lbs Montana - usually get 10 - 11 mpg. When I'm empty I have gotten 28 mpg on a 1000 mile road trip - that 3.42 really helps with the mpg. My truck has a 3500 payload and 17,500ish max towing capacity. If you get a RAM 3500 diesel dually then you get a 4.10 rear end and properly equipped I think It's rated to pull 35,000ish pounds. BIG DIFFERENCE! I've seen pickup trucks with gas engines that have 4.10 or 4.30 rear-ends. Those gas engines (even the big ones don't have that much torque - maybe 420 - 450 lb/ft of torque. You need a low rear-end to get a big heavy load moving. It's very similar to the gearing on a bike. If you are big and powerful (big quads) you can get that bike moving in a high gear. If you quads aren't that powerful you need to shift to a lower gear (lower rear-end) to get that bike moving or climb that big hill. I hope some of my rambling helps. Sac Colorado
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