That is one heavy trailer. To me, that's a 3/4 ton towable not a 1/2 ton towable but nice to see the 5.4L showing it's low end torque off.
With my family and gear, it would be to much trailer.
In fact what does your hitch weight come in at loaded? Going by it's dry weight of 7400 lbs, adding a few hundred lbs for options and another 1000 lbs after loading it, you would be to heavy on the hitch weight for the trucks hitch receiver rating. The rating on the 2009 - 2012 is 1050 lbs and at the average 13% (which it could be even higher) is at 1131 lbs. This is definitely 3/4 ton truck territory with that monster.
Glad to see you have gotten away with pulling it.