I tow a 23' FunFinderX, loaded for us to the gills it comes in right at 6300 lbs. I use the Progressive Equal-i-zer hitch and a Tekonsha P3 brake controller. Until I hit hills I don't know the thing is back there until I look in the rear view mirror and wonder who's tailgating me
If you've got the Mopar Tow Package, you'll have the cooler and beefed up alternator for keeping the rig charged.
Light hills, no problem. Steep, we do have some 8%+ grades around here, and it'll drop down a gear, but, keep right on hauling. When it kicks down you have to watch the speed - it will pick up speed. Never had a motor pull so strong.
If I'm in flat territory, I pull without the Tow/Haul, but, I lock the system into 4th as opposed to drive. Hills / Mtns. - I use the Tow / Haul. It locks out the overdrive gears and appears to disable the MDS along with changing the 2 - 3rd shift points. I haven't been able to find out the exact workings of the Tow / Haul, but, that's what I've noticed.
Towing at 60 - 63 mph in the hills (PA Turnpike, Pittsbugh to Bedford), Tow / Haul on, I get about 12.5 mpg. Not too bad. Next outting, I'm going to try 55 - 60 mph to see what I can get. I've found that at 63 mph, with no trailer, using the cruise control, I can squeeze 21.5 out of that Hemi. Annoyed me at first, driving that slow, but, gas being what it is, I've learned to slow down "and smell the roses". Actually much more relaxing - I can drive for hours now without any profanity
Take your time setting up the WD hitch...with the Commander's 4 wheel drive , you want to be as balanced as possible to keep the transfer cases loaded evenly. Go to "severe use" service intervals and you should be fine. The only problem you'll have, probably, is getting the hitch low enough. Your tongue on that trailer is probably right around 18", while the Commander's hitch sits at an unreal 26"...without a lift. I was originally going to put a lift on mine until I started setting up the hitch for towing...glad I did the RV first