We subscribe to Direct TV and take our receiver from home. We use the Winegard G2 carry out dish and are generally pleased with the overall service. They are good in changing customers to local area stations a change we make a number of times during our winter travels.
The portable dish does not pick up DT HD programing, which we have not found to be an issue.
I have read there are changes in the works for DT since being bought by AT&T, something is happening in a year or two with the discontinuation of one of their satellite, the specifics of which I can't remember, but will negatively affect services. I have also read that by 2020, there is talk of dropping satellite service altogether and just going with streaming services.
From what I have picked up on other forums Dish appears to be a very popular system with a lot of R V travelers