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Ron,
I didn't know there was a set pressure for the pinbox? I never check ours, just set it to the arrows and thats it. With it set at the pressure you mention, is that what it takes to line it up?
The empty Dually ride is a rough one for sure, but is usually better when loaded. A few things to check (you may have already done this), is the trailer attitude level as well as the truck? If the truck is too high in the rear the springs may not be doing their job, and if the trailer is too high in the front, you may not be transferring enough pin wt fwd to allow the trucks suspension to work. A MS should have plenty of pin wt, but worth a look anyway.
The more air you run in the truck's rear airbags will make the ride harder. Run just enough when loaded to have the truck level.
It's all a bit of a balancing effort to get the hitch and pinbox heights, airbags, and trailair box set to the right height.
Cheers,
Bill
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