I have an '06 SCrew 4x2 with 5.4L, 3.55 LS rear, 17" rims, and factory towing. I pull a 28' travel trailer with an Equal-I-Zer hitch, Ride Rite air bags, and a Prodigy brake controller. Gross weight of the whole rig, completely loaded up is 13,350# (~7600# trailer)......this is over the scale at the local grain elevator, not a guess (~5700# truck on same scale).

I have had no issues what-so-ever on the moderate terrain in IL.

I installed the air bags to help firm up the rear end and take out some squirm...something they did very nicely.

Good brakes/controller and a good anti-sway hitch are "must haves"

FWIW I've gotten 8-11mpg pulling this rig, mainly dependant on wind.