FireUp, If your coach has the spin on, it is exactly like my old 2003 Winnebago. I was able to perform all required service with the unit in place, but the bracket had to be loosened from the frame. I wasn't able to make mine "fire engine clean", but it was clean enough.
BTW, FL says that the service interval for the "spin on" is 18mos. That's probably overkill, but someone had some issues at some time, so that's their story.
FWIW, The guys at Haldex (the manufacturer) in KC told me that it didn't need to be changed that often.