Congratulations on your new coach! You will really enjoy it.
Here are some maintenance things to consider:
Assuming you have TranSynd fluid in the tranny:
36 months - Main & Lube Filter Change
48 months - change fluid
(Note - I would do both at 36 months)
Air cleaner replacement @ 24 months
Air Brake Dryer system filters (dessicant & coalesent) @ 36months
Coolant replacement @ 36 months
If you don't have the service records for your coach I would have these items done to make sure your coach is up to snuff.
Sounds like your're ready for the 36 month service. This is also known as an M3 at Freightliner. Including engine oil, lube,fuel filter,fuel/water separator (each of which should be changed annually) you'll be looking at (with all the above stuff included) $1K+. Here is a link
to the Freightliner forum on the M3 service.
If it hasn't had these services done, I would highly recommend you have them done.
Good luck with your new coach!