I towed 2 lifted Zuki's on a large flatbed. I had 3 people in the cab and camping gear. My truck is a 4.6 with 3.55 gears. I was actually able to get the trans into overdrive as long as I was on flat ground and maintain 65 MPH but you could tell the truck was straining and hauling a huge load.
What axle gears do you have? Your 5.4 will pull better than my 4.6 but then again your Jeeps are another 1k heavier each than my Zukis were.
Either way the truck will be overloaded no doubt, but I do believe it will do it. I pulled my load for over 250 miles one way and we didnt run into any issues, even got an amazing 11 MPG
We had a couple hundred pounds of firewood in the bed, but due to having to cram the zukis on there with no WD hitch the back sat pretty low