Proper Hitch Height

To answer your questions, Yes. I've gone over it several times. I have tried to change the spacer washers +/-. What seems to be the difference is the auto ride control. When I shutdown my tow vehicle and let everything go down with the weight of the trailer there is tension on the bars. After I start-up and the auto-ride airs up the trailer seems to be higher at the hitch, causing the weight shift to the back and feel like the trailer is lifting the vehicle while driving in high winds and truck traffic. The adjustable hitch shank can only drop down 4", and I was looking at a 6 or 8" drop depending on ground clearance.