I have a 2014 Gateway 3650 BH. There are two coax inputs in the docking center. I labeled them, but off the top of my head today I can't remember which was which. I believe satellite was on the left, but I'm not positive right now. One was a satellite input that leads directly to the kitchen/living area, in the cupboard below the main TV. In this cupboard I installed a new directTV receiver and the power inserter box for the SWiM dish. The other coax connection in the docking center leads to a splitter that then leads to each of the TVs (kitchen/living, bedroom, bunk room, and outdoor kitchen). This would be where campsite cable TV would be connected, and would feed all the TVs. The OTA roof antenna is combined into these feeds as well, so each TV has a Cable/Antenna jack. Only the kitchen/living TV has a second satellite jack fed from the input in the docking center.
I have existing DirecTV service at home. I called them one day and asked for another HD receiver (non-DVR) for the trailer. I have been a DirecTV customer for over 2 years. They sent me an HD receiver for free. There is a $6/month charge for the additional receiver.
I already had a spare SlimLine 5 dish. I purchased a "non-penetrating roof mount" off Amazon (intended to mount a dish on an apartment roof, etc.) that just sits on the ground and you put 2-4 cinder blocks on it to keep it in place. I haul the mount and cinder blocks in the bed of my truck. When I get to the campsite it takes about 5 minutes to get the mount and dish set up and connected to the trailer, and another 5-10 minutes to align the dish. There are numerous iPhone apps that can tell you the proper alignment numbers, that helps a lot. The trick to the alignment is a perfectly vertical mounting "post". Once you have that, and the alignment numbers (skew, azimuth, direction) dialed into dish itself, you're usually pretty close.
I would like a more portable solution. The SlimLine 5 dish is the big dish, so it’s kind of a pain to haul around. I have read pages on the internet where people have mounted a SlimLine 3 LNB to an old phase 3 dish, and that worked for HD. Someday I might try that, but that’s getting into the “hacking” realm and I’d need to be pretty bored to undertake that. For now I’m investigating a way to “fold up” the LNB arm on the SlimLine 5 dish to make it more portable.
Keep in mind that all the above effort is so I can get an HD signal from DirecTV. If all I wanted was a standard def signal, a standard def receiver and one of the auto-point dome dishes would be the way to go. But currently I don’t know of any auto-point dishes that can get HD (SWiM receiver compatible) for DirecTV.