I know you didn't ask this, but I'll throw in my 2 cents. I was going to put a dish on the roof of my previous trailer and I was given the advice not to. The reasoning was that a lot of nice places to park have trees that would be in the way. I started looking and most places we park we couldn't use a roof mounted dish. With the carry out style you can always find a hole in the trees to get a signal
One more thing, we had 2006 Prowler TT and I had to take the wall plates of and remove a splitter to get my satellite to work.
Good luck!