You may be dealing with 2 different issues here. The first issue is RV related warranty work which should be completed by the dealer. These types of issues can take a long time at the dealership. The second issue is the performance of the chassis, and that would be dealt with by a Cummins dealer. Looks like you have a juggling act for scheduling these issues.
I have found it very helpful to shoot some video of the problem I experience. That shows the dealer in real time what is going on and helps with the diagnosis.
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May your smiles be many and the miles be plenty.
Karen & Allen Van Zandt
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