I will offer some input since I have a 2000 Ultrasport. My engine is a Cummins ISB, 260 HP, 5 speed Allison. You no doubt have a Freightliner chassis and I can offer their customer service number, 1 800 385 4357. They are most helpful long after your warranty has expired. My chassis is XCS which might have been discontinued before 2003. If you have airbags then your chassis is XC. There is some info you should have if you have the XCS, nothing negative so don't be concerned. Freightliner will be your best place to start to find chassis manuals. Appliance manuals would come from their manufacturer. You might make sure all preventive maintenance has been done. If you have no records then you might err on the side of caution and do the maintenance if in doubt. I have had excellent reliability from my Ultrasport for 11 years. There is a Camp Freightliner in Gaffney you might want to consider if you are new to a diesel.
2014 Palazzo 33.2
Cummins 6.7 ISB, Allison 2100 6 Speed