well I ordered the new WD system because my initial one wasn't adjustable. It was 4 inches higher and I didn't want to squat the back of my truck a whole 4 inches to make trailer level. The new system I will setup according to the procedure listed on here. At first I was just in shock to think that little bit could cause it. I should get it tomorrow and I will get it put on and see how it goes.
The jerking happened the first time when I had 1800lbs on the tongue.. It wasn't really porposing as it was more of the trailer pushing the truck back and forth which I think might of been just due to a little give in the hitch system. I did add airbags to the back and I pumped them up with about 17lbs last night and I didn't really feel the bumps or porposing at all for the most part just the sway that happened that was pretty scary. Out here in Nevada its not uncommon for 30 to 60 mph gusts so that is what scares me about this trip. If I can get the hell out of this state and over to florida with nice calm days and no crosswinds then i'll be happy.