We too used to do this a few years back... No problem for us doing the DIRECTV Standard SAT TV. We would bring along our own portable SAT Dish with a two head port and a couple of SAT RCVRs from the house. Alot of times we had to call DIRECTV to reset our SAT RCVRS as they lost their settings sometimes. Never a problem having them reeset the SAT RCVRs. You can also do this ON-LINE just need your account - just need your acct number...
We would run two RG cables from the dish setup with one SAT RCVR in the main area and the second SAT RCVR in the bedroom area.
What we did was use the video output of the SAt RCVRs and this allowed us to use our TV remotes to select SAT-CABLE-OTA TV signals...
Don't know how any of this would work with today fancy stuff you have mentioned... Getting full high def SAT TV may be a different story...
When the NATL BROADCAST changed over to digital high def TV in 2009 we stopped bringing along our SAT TV items and just use our OTA BATWING to pick up HDTV from the local towns...
I hear some folks run into problems with DIRECTV when they try to get them to install their system to just run from the HOME ACCOUNT units in the RV's... DIRECTV also has a separate monthly account program for using DIRECTV in RVs but as far as I know you can use your home account anywhere you want to. The DIRECTV local station is geared to your ZIPCODE and will not work when get outside you zip area...
Roy Ken