Hi Amy, I am not for sure of any bilstein shocks for the 4200 chassis, the factory shocks are just fine, but the RV dealer will have to go to an International dealer to purchase the shocks and mounts, and get the measurements for the upper mounts.
The shocks will not soften the ride, it will calm down the rocking, and damping the spring rebound.
Good Luck, Walldo
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2008 SN 6373
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