My rig leaned about two inches to the right also. Dealer measured and said all was "within tolerances". Took it to Workhorse Service Center, who said right front spring was sagging. They replaced the spring, no help.
I had Henderson's Lineup in Grants Pass, OR, fix it. They shimmed it and leveled it all around.
I also had Henderson's install front and rear anti-sway bars, and a rear Trac-Bar. (Workhorse had previously installed a Davis TruTrac bar on the front). Also, new Bilstein shocks.
Now, it handles like it should have from day one!