Which satellite system do you have in your stick house (if you have one)? If you have Dish network and a Hopper, you can use your Hopper in your new rig. In any case, you need to determine if you want a motion system, non-motion self-aiming, portable with HD, or a dish on a tripod.
We use the latter for now. I take the Hopper from our bedroom in our stick house and use it in the motor home. If you have a hopper, it's pretty easy to setup and even easier with a self aiming non motion system like a Winegard SK-1000 TRAVLER system. We will be getting one of these over the winter.
If you don't have a satellite system, Dish Network has a plan where you can turn billing on and off as needed and other plans. Here is a link...
DISHForMyRV: DISH Mobile Satellite Systems & Pay-As-You-Go TV for RV, Tailgating, & the Great Outdoors
It is daunting, but with a VIP 211k receiver, you can add a hard drive and have a DVR along with pausing live programming. The only catch with this system is that you have only one tuner and you need to watch what you record--unless you're not in the motorhome, then you can just record away.
Scott