I don't think the FCC allows DirecTV to give you access to more than one market at a time, so no east-west feeds at the same time.
We did a 3,000 mile trip this fall, from Seattle to Utah to Oregon, and at each major stop, we called DirecTV customer service and had them update our address to the new location so we could get local networks. We could not receive Seattle networks while in Utah - something about the location on the satellite was not accessible (not sure why, but if we could have stayed with Seattle stations, we would have).
Ease of changing the service address varied with the rep on the phone. The first guy was great. The second was annoying, the third was down-right DIFFICULT. Getting the service back to our BILLING address was the hardest one to do??
Just remember your LAST service address when you ask them to change it to a new one. They need to know you are who you say you are (based on where you were last)... even when changing it back to the BILLING address, they grilled me on where our last campground was, and didn't like my answer when I said "somewhere in Oregon". <sigh>
I'd say plan on 20-30 minutes on the phone to update the DirecTV to a new location, and you should be good to go. We've been with DirecTV for 20 years now... and overall are very happy with them.
Tina & Dave
plus the co-pilot Denna (english mastiff)
2015 Seneca 37TS