06’ 9900i rear IROS suspension height valve setting help

[Luckyjayb]

Can’t get ahold of a dealer on Sunday to find out my rear suspension height settings. Truck has the IROS suspension and new leveling valve. Rear axle airbags are fully extended and creating a rough ride and the front axle is still seated properly. New tires, shocks, bushing, air bags, the whole nine yards. Just want to get the rear air ride setting done correctly. Just got the cab bags and shocks changed and got that set properly. Thanks in advance for the help. Truck has 40k rears.