I have a 2011 NT 26LRSS, I tow with a 2101 F150 5.4, 3.73. It has a GVW or 7650 and a max payload of 1853. My TT weighs in at 7000 +or-. It has a tongue weight of 750-900lbs. I say 750 -900 because I normaly tow it with around 750lb but have been trying a heavier tongue weight to maybe eliminate some jerk. Anyway every time the back wheels on the truck hit a bump, small or large the truck jerks. I have towed this TT with my previous TV which was an 08 F150 and had the same problems. I even had the oppurtunity to tow with an F350 and still had some jerkiness. I have used 800, 1000, and 1200lb bars. I have tried different links, different head tilt and the previous truck had air bags, stiffer tires (not E though) and new Bilstiens. the 2010 is all stock with only 1300 miles. I have used EAZ-Lift and also a 1200lb Reese DC. It still jerks to the point that it's uncomfortable. On smooth road its fine but even hitting a man hole cover going thru town causes it to jerk. I'm beginning to wonder if the TT has some design flaws. After all it has jerked with 3 different truck. I even left it at the dealer for a day and they could do no better than I could. In fact it was worse. I always measure everything and with my last hook up with the 1200lb bars I had rear sag of 1-1/4" and the front sagged 1/2", the TT was down in the front 1/2". I really getting frustrated. I have been trying different set ups since we got the TT last Oct and have never been able to get a smooth ride. The trailer we had before while only weighing 4100lbs with a hitch weight of 500lbs pulled like a cloud. Never felt it back there. I know other people pull trailers equall to what I have witth 1/2 tons and seem to have bo trouble. I do get all my weights from the local truck scale. Any feed back would be helpfull.