To meet your needs, I suggest you do as Harley Dave suggested... use the Dish 612 receiver, or similar, if you need to pull in more than one channel at the same time.
I highly suggest that you simply add whatever receiver you buy to your home account as a second receiver..... it only costs $7. per month additional. The only caveat to that is that when you are in the RV traveling and you notify DISH of your new location so that you will get the local channels, the home station will lose those home channels during that period of your travels. This is not a problem if no one is home watching the home TV.
