Suggestions for improving Dodge dually ride and handling

OK...I'll play Capt Obvious...
1) Yes, a 7000# rig is going to handle a lot different than a 12,000# rig.
2) 12 yrs is a lifetime in truck evolution
3) Some Dodge trucks require front end rebuild/modification (search "death wobble")
4) Need more specifics on axle weights, any mods done to truck, tires/wheels, psi, etc...

You should be able to make this rig handle just fine...it's plenty of truck for that camper. Like any rig, you will need to dial it in.
Bill