Suggestions for improving Dodge dually ride and handling

The set of things you can do are below.

1. Better shocks. I don't know how good the KYB Monomax shocks are compared to Bilstein 4600s, but the Bilsteins are fantastic.
2. Bigger sway bar or add a sway bar.
3. Steering stabilizer shocks.
4. Timbrens, Supersprings, or Airbags.
5. Extended bump stops or Upper Stableloaads.
6. Lower Stableloads.

My guess is your shocks are valved wrong for a camper. You can probably change the steering box.