I have a Vegas E-450 Chassis 24.1. The suspension mods are: Bilstein all around including steering, Sumos front and rear, Hellwig Stabilizer bars front and rear, and a SuperSteer Trac bar. It's night and day different from stock. The next mod will be better tires. Incorporating all the mods makes for a small house on wheels that handles really well.
. ... Not as sweet as a dynamic "ambulance" suspension, but damn good over the stock wallowing pig.