I'm guessing it is a rack & pinion gear driven mechanism rather than hydraulic. If so, there is no need to grease the gears - the speeds are so low and the use so infrequent that grease causes more problems (dirt retention) than it prevents.
Some people like to treat the rubber flappers and seals with a dry silicone lube or something like 303 to help keep the rubber supple. There is no solid evidence that this helps, but it doesn't hurt either.
The primary "maintenance" is to inspect the flappers and seals occasionally to make sure they are not torn or loose. The seals can usually be reattached with a good weatherstrip cement (or maybe staples in some locations). The flappers can be more difficult - see how they were originally attached and try to do the same. Tirn seals can be replaced. If the RV manufacturer doesn't have them available, you can usually get them from an independent source that sells seals and weather stripping.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL