International 9400 vs 9900

[Daytripper]

I have a 05' 9400 sleeper...the truck rides like a teeter tottering when loaded....I figured it would ride nice with the longer wheel base...shocks are all new...complete new leaf springs in both axles in the rear...is this just a characteristic of this truck? I'm looking at a 9900 series international and wonder if they ride the same(appear to be the same chassis but just upgraded cab)?

[GhostHauling]

From my personal experience driving Axle-Back vs Forward-Axles has been axle backs almost never ride and handle as well as Set forward axles but set forward axles don’t turn as well but if your a good driver it won’t matter.

[Chamberpains]

Is your ride height set properly? Is the cab suspension completely junk? International sells an entire bolt in unit to replace everything in the cab suspension. It was very reasonably priced and made the job extremely easy to do. What do your torsion bars look like? Are the bushings toast? How new are the tires? New tires made mine feel like it was swimming. My 9400i rode decent but you have to replace all that 16 year old suspension stuff. It only lasts so long before it doesn't work.