Hi Jerry,
I have a Workhorse P32 chassis that was giving me the same trouble and more. No one locally help, even after a tire alignment. I have just returned from Henderson's Line-up in Grants Pass, OR where they did a ride performance assessment ,RPA. After the drive, they found several problems. Their Super Steer parts, and new Koni Shocks and new stabilizer brackets have really helped.
See FMCA magazine Dec. 2011. I know they are in Oregon, but they do ship to other areas. While I was there, a couple from Texas were there as Henderson's offered the best alternatives for them. Visit the mag. article and the Henderson's web site.
Good luck
2004 Winnebago Brave