I own the west coast version of the 2910 which is a bit lighter tongue wt. at 640 and UVW of 5530. I pull it with an Infiniti '04 QX56 with nearly identical specs to your Armada.
Details: Class IV installed, WDH, Sway Cntrl, auto-leveling on back axle, and have no problems at all, even with a full load of water.
I don't forget it is there like I would with my neighbor's long-bed diesel, but I love how it tows. I may install a 2nd sway control, as the winds on OR and WA coast are sometimes a bit stressful, but otherwise a good experience.