This past weekend, I towed the GTO out for a NASA road race weekend using a steel trailer I borrowed from a friend.
300-400lb in tools
~6000lb total load
I loaded the car on backwards to move more of the weight to the rear of the trailer, and headed out.
Total trip was about 120mi each way, and it did great. Averaged 16mpg during the trip, about 65-70mph, at around 2k rpms. Here in TX, there's not much in the way of hills to deal with, so it was a very smooth and worry free trip.
I cranked the boost rating on the Tekonsha brake controller I installed
up to level 3, and had no problems slowing or stopping. Honestly, with this controller, the trailer was barely noticeable during braking.
Getting moving wasn't as bad as I thought it was going to be either. It was a bit slow, unless I let the motor come up to 5500rpm+, but I let it shift earlier and gave up some acceleration. At one point, I did drag race my buddy in the paddock, with our cars and trailers hooked up LOL! He has a Chevy 2500 crewcab turbo diesel, and was towing about a 8000lb load ... believe it or not, we were neck-and-neck through the empty (yes, everyone had already gone home)paddock, until about 40mph, then had to stop because we ran out of room.
Handling was very nice on the highway. As you can see form the picture, frontal area is fairly minimal on my setup, but it was very windy on the way out there. Every now and then there would be a bit of sway, but nothing to be alarmed about. I never used the manual brake lever on the controller.
I'm still going to get an aluminum trailer for the long term, and will probably get a distribution hitch so I don't have to load vehicles on in reverse, but I'm extremely satisfied with the Durango's capability to tow a load of this weight