You have a few different rv sat options, google it to research them.
I use a tailgater because :
its automatic easy to set up (5 mns. ) and offers month to month service . ( Use it when you need it )
It also uses one single wire for service as well as 12 v. power. Other systems require tow separate wires.
You can order your local sports and bring the team with you by a sports package or by regular locals channels.
The 411 receiver works with the tailgater. I do not have the DVR option but I think its avl.
When I order monthly service , I always try it out in my driveway at home before I leave on a trip. Using it the first day once its been off for a few months , the service might not boot up correctly. The software goes into a 'sleep mode' and DISH has to send an electronic bullet over the airwaves to wake it up. Its just an extra customer service phone call if that happens. It happened to me 3-4x .
Dish was supposed to work that out in future software updates. I have not used mine in a year , so I don't know if they did upgrade it or not. Either way, its not a big deal.
http://www.gotailgater.com/This below link is a good site to view the area you intend to use it . It will show you if you have a clear reception shot or not .
echostar sats: 110/119 and I think 129 are avl. with the 411/tailgater.
http://www.dishpointer.com/I now place it on my tc roof by using my cabover escape hatch for access. If trees block me, I place it on the ground up to 100 ft away for a clear shot.
I only usually get a 60 signal strength but hardly ever loose it during a good rain, it works very well .
Dish tech told me to use the upgraded connector with the blue center. He said the OEM connector that was on the tc would eventually burn out. I bought this at H.Depot. I guess it's because it carries a signal as well as 12 v power ( maybe ? )
Hope this info helps you in your sat antenna decision.
Bob