I would get it all setup to work in the house first where you have everything you need to hookup to it.
Once it is working legally in the house then just move it to the RV. The one thing I had to remember was to have the account number and phone numbers to call as many times when I moved the SAT RCVR it would lose it setups and I had to call DirecTv to reset things. I ended up taping the account info to the SAT RCVR...
DirecTv condons the use of your legal SAT RCVR anywhere you wish to use it. The only downside may be your local broadcast selections on your DirecTv account will probably not work when you get outside your assigned ZIPCODE area.
I used to carry my SAT RCVR from my bedroom to the RV all the the time until the NATL BROADCAST network came out with their digital HDTV. Now we just use RV Televison to watch the National Broadcast channels to the public for free like NBC-CBS etc using our OTA BATWING antenna to pick up these stations from the local towns around the campground. They are all in full blown high def TV mode where my SAT reception was only the standard TV signals.
Roy Ken