It will defiantly roll it down the road, no question there. It will even feel good when you step on the gas. I did it with a similar set up, around 7500lbs with the trailer and cargo. I also have trailer brakes usually set at 8-10 for gain. What they are not telling you is that this is a huge strain on your driveline, and rear suspension. You are essentially doubling the weight of your truck. It's like saying I can ride my dirtbike off the roof of my house and stick the landing. This may work, just not every time. Eventually something will break (in my case 2nd gear slipping on a 2013 f150 5.0). I agree for occasional short hauls, no problem. Longer trips on a regular basis, buyer be ware.
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