I would do the ride height validation, and be sure the recall was taken care of. You do not mention if you have tags or not, suspect no.
The air bags 'carry/control' the majority of your rear suspension. You can search and find many posts of rear shock breaks that the owner did not know about for quite sometime.
- validate rear height and valves are working well
- set Koni SP1 to 5 setting
- front IFS, Road Kings -or- Koni SP3 on setting 5 ($$$ saving between these two)
- add Super Steer Motion Control Units front and rear
I have a 40' Allure wit tags. Went with 6 Road Kings, SS MCU's. Very pleased with the handling. But, Koni's third generation of Adjustables came out after I did this. If $$ is tight, suspect the SP3 generation on front, with rear SP1's on 5' and SS MCU's would be a big improvement. If happy stop, if not RK's front next. Etc., until you are happy.
$$$ But 'handling' of the rig, is a safety factor. The best you can make it handle, the safer you are on the road. All, IMO!
Best of luck, have fun, be safe,
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...