Again, you own a NEWMAR, we own an ALPINE, with a Peak Chassis, and our manual calls for 3000 miles service on the U-Joint, and the slip joint on the drive shaft. I think Old Scout gave me a xls file (Microsoft Excel File-you can download an excel reader from Microsoft website) showing when/what/etc., on all the maintenance items on the Coach. Some items on the chart are for air brake coaches only, as the ones with Hydraulic Brakes don't have an air reservoir/tank.
Hope the attachment made it if not send me PM for the file.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech