I looked at the Features sheet for your RV and it looks like you have a single input shared for Cable or Sat. So the first important question is whether you're talking about Dish or DirectTV.
With Dish, no splitters allowed unless you have a Hopper/Joey setup.
With DirecTV and SWM technology, if you put your power inserter outside, you might be able to use the wiring/splitters that are there, but probably not. Hopefully some Flagstaff owners can relate their experiences.