Originally Posted by captbenjy
The difference usually between a 3/4 ton and one ton truck is normally the size of the ring and pinion, axle diameter, and usually the addition of another leaf spring. Also the gear ratio is normally lower to maximize torque for towing. That results in less MPG though when not towing. The dually gives more stability and spreads the weight out over another set of tires and gives the added security in case of a blow out. Power wise, my F250 would yank your trailer from coast to coast no problem.
Honestly, the differences aren't even that extreme. Most 3/4 tons are 1 leaf spring away from a 1 ton. If it's a diesel, most use 3.73 gearing, regardless of 2500/3500. Axles stay the same, brakes, etc. Only difference if you go dually, and even then, not much change. Axle ratio changes if you add "max tow" packages.
You can add things to 3/4 ton trucks to make them 1 ton capable, but the law still looks at the door sticker. If your overweight, you're still overweight.