TAILGATER!
The OP doesn't say Dish or Direct(?) so sorry - Tailgater is Dish only equipment...
BUT the VuQube Flex is basically the same portable for other service providers.
VuQube Products
One cable connection.
Auto aiming.
Included software for set-up.
HD capable.
DishNet has the pay-as-you-go for RV's, HD on standard plans and the very simple to use ViP-211k receiver. Add an external hard drive to make it a DVR. DTV-OTA channels are scanned and displayed on the receiver. LOVE IT!
I was using a simple crank-up for over a year, but since I like to park the RV near "evil SAT signal sucking" shade trees, I soon decided a portable SAT dish would greatly improve my TV experience.
Best luck