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The 6.0 gas engine will pull the trailer, but not well. If you poll long time users, they will overwhelmingly tell you to go diesel. As for the difference between 2500 and 3500, there are a few things, all with the rear end. The 3500 Single Rear Wheel (SRW) has higher rated steel wheels and tires (from the factory), as well as an additional spring. The 3500 Dually has all that plus the additional wheels/tires. Axles, brakes, frames and drive trains are all the same.
When considering using a 3/4 ton vs a 1 ton, you need to look at the pin weight of the trailer loaded to determine if the truck will handle it and the GVW of the trailer. Also, just because a truck CAN pull a trailer. doesn't mean it's legal or safe to do so.
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