Our older RV did not have HDMI TVs so I used 2 older receivers and an 18" dish on a tripod to get TV service. Worked great once I learnt how to set it up. It would take me about 20 min. including logging in to Direct TV to get the coordinates. Was a pain in the butt when we stayed in an RV park for just one night. So, I ended up getting a King Flex VQ2100 from Amazon it worked great.
With our new RV we now have 2 HDMI TVs. I ended up getting the appropriate receivers, one HR24 and one H24. Was a real pain in the butt trying to figure out how to program the King Flex, but now I know how and it works really great. We have HD TV all the time now. Wife is happy so you know who else is happy.
Get yourself a King Flex and forget about all the issues with portable dishes and tripods.
With the King Flex you determine where South is in a clear area, point the handle to the North, hook up your cables an "voila" you got TV. No fuss no muss. The King Flex searches for the satellites automatically and locks in to them.