ok, there are differences in the armada depending on what year you have. Some have load leveling suspension, some don't. Some have a higher payload than others. Many on here are well versed in the issues I had towing my 7000 lb 30' TT with my 04 armada (it had load leveling suspension). We spent a lot of time and money trying to correct my issues. in the end I upgraded to an F250 and couldn't be happier. Let me tell you what my issues were. I would tow down a highway and be pushed all over the road by passing vehicles of any size. I am also talking about the unit moving as one like you describe. I had a lot of tail wagging the dog type problems and was constantly white knuckle driving. my engine would scream and try to overheat the tranny towing up a 7% grade no matter how much I downshifted to help it out. I would be crawling by the top, one time I was even down to 25 mph by the top of the mountain. coming down the mountain was no picnic. I tried every trick learned in 20 yrs of towing and still had to use my brakes more than I wanted resulting in overheated brakes because the engine wasn't strong enough to hold the TT back. I was done, I upgraded but before I hit that point I had switched to E rated tires, put a prodigy P3 on as a brake controller, spent countless hours and posts on getting the wdh dialed in (Reese dual cam). What I learned at the cat scales was eye opening. I was way under overall stated tow capacity of 9100 lbs but way over on payload. I had an available payload of 810 lbs after accounting for 2 adults, 1 small child and a 70 lb dog. plus full tank of fuel. My loaded tongue weight is close to 1000 lbs. I was over and it mattered. others have towed similar weights and lengths with newer armadas and done ok. some of them are towing with a Hensley arrow.
Also, if you ave the load leveling suspension, the set up process is harder but not impossible. You have to drop the TT on the ball, shut the truck off before the load leveling suspension kicks in, finish hooking up, do your measurements before letting that kick in. Then go to the scale and check the axle weights to see where it stands. If you have never weighed it, I strongly suggest doing this. Weigh your armada loaded ready to camp with all passengers, pets and gear you intend to have in it when towing plus a full tank of fuel. Then weigh it with the TT attached (same requirements as above).
www.catscale.com Once weighed, subtract the armadas scaled weight from its gvwr, this is your available payload. your loaded tongue weight needs to be less than this (typical tongue weight is 13-15% of loaded TT weight). When hooked to the TT, have the TT on 1 pad, the TV front axle on one pad and the tow vehicle rear axle on one pad. add together the TV axle weights for TV loaded weight with TT tongue weight included.... are you over on gvw? is your rear axle weight over the armadas max rear gawr? If you are within weight ratings, you can also use the scale to help adjust the wdh. you want the wdh adjusted to have the front axle as close to unloaded weight as possible without going over.
A big help to figuring this out for you is for you to tell us about your armada and your TT. what year armada, is it LE, se, engine, rear axle ratio, etc. What year make model is your TT, what does it weigh loaded. if you don't know this, what is the dry weight on the little sticker inside the TT and what is the gvwr of the TT?
2014 Silverado 3500 Duramax, SRW, Crew Cab, 4WD
2014 Palomino Sabre 34REQS -
2011 Crossroads Zinger ZT26BL - sold in 2014