The answer to your question depends on what channel package you want to get while on the road, if you want HD or not, and what reciever you will use. Also if you use an outside ground dish of some kind how will you cable it and get the signal to the satellite receiver and from there to the TV. If you want HD you will need to get an HDMI cable between the satellite receiver and the TV, The broad spectrum of channels reside on 3 satellites. If you say no HD that is a bit simpler, if you say a receiver with a single tuner where all TVs watch the same channel all the time, and I'll use whatver channel set one satellite is providing then that is simpler but limiting. Here is some Winegard info.
http://www.winegard.com/portable-satellite-antennas/index.php?q=rvI would consider a receiver with a single HD tuner and a carry out as a baseline system that works well today and is easy to set up. That gives you HD, a DVR if you like, all of the channels in your package but you will need to watch one channel at a time. You could sell it or take it with you to another coach. The cables need to be planned as to how you get this to work in your specific coach. This means that you have to set the dish cables up at your campsite when you pull in. There are two cables but if installed right you can make that easy to do with exterior connectors. If you find this coach is a keeper then you could go the route of the Winegard Travler and sell the Carry Out. You would have the expense of two installs as far as cabling.
You may want to call Winegard for some help in choosing what will work for you.
Later Ed