[Fulltiming]

I have a maintenance list from Newell in 2007. At that time the filters they listed were:
As Needed:
Air filters on air conditioners

6 Months or 15K miles:
Engine oil filters
Fuel filters

500 Hours/1 year (100 hours if non-synthetic):
Generator oil filter

12 Months:
Aqua-Hot fuel filters
Nalcool engine filter
Change air dryer filter
Water filter cartridges (Everpure, Amana)
Power steering reservoir filter
Replace PuraGuard fitler for EGR vlave (#688 and after)

25K Miles:
Engine Air Filter

Every 2 years:
Air dryer filters on 110 V and main air engine

Every 3 years:
Allison Gold filter @ 75K miles or 3 years