The best for DirecTV is the Winegard Trav'ler and a Genie receiver or any receiver you currently use at home (just move it to the RV).
As mentioned, DTV does not offer internet. Your best option will be a good cell plan with as much data as you can afford. This won't help if you travel to remote locations frequently with little or no cell service. If that's the case you can get satellite internet service but it requires large, manually setup and stored antenna and receiver equipment. It's a bit pricey but it works anywhere in the US (lower 48) you have a clear view of the Southern Sky.
