Well it would. This is the reason diesels are so much better for pulling. They have a much larger torque curve and in your example, the engine is working half as hard to generate the same torque. With a diesel you get torque much sooner and for much longer, where a gas has to rev much higher to generate the similar amounts of power. If your diesel was running at 3500 rpms, you would be in big trouble. The other comment is spot on with heat, if you are running that much higher, you are going to be throwing off tons of heat which kills power, longevity, etc. Tunes are a great idea, but they will void your warranty so make sure you know what you are getting into when you sign up for those. All tunes are 100% detectable, regardless of what the tuning company will tell you so make sure you know the risks. Bottom line is that the 6.2 is a great motor, but it is going to have to work really hard to pull a giant trailer like that. You are going to get miserable mileage and really pushing that motor over what it is comfortable doing. It can, but I would really drive by the gauges and make sure you take care of it so you don't overheat it. I wouldn't worry about the transmission, it is the new 6R140 transmission. What that means is that it has 6 forward gears, reverse and is designed for 1400 pounds of torque. As I like to say, if you have 6 wheels on the trailer, you really need 6 wheels on the tow vehicle. Also, there is a reason why you can't get the duallies in a gas version anymore because when you are towing that amount of weight, you really should have a diesel as they are much better suited for big towing. Sorry to be long winded, but if you are going to tow something that big with a gas burner, expect to get really poor mileage and know that the truck is going to rev REALLY high and in a lower gear to try and generate the amount of torque needed to pull it. You are going to have to really pay attention to your temperatures on your tranny and engine to avoid something bad. Good luck!