Both DirecTV and DISH offer mobile solutions. Prices, of course, vary based on packages selected, contract term, etc.
With a little bit of technical expertise, you can sign up for home service and "take it with you" so to speak. YouTube has several videos of individuals who purchased an additional dish/LNB setup and a tripod or "skid" to which the dish is mounted at the campsite.
Make sure the dish and LNB that you purchase (or get for free) are compatible with your receiver.
Many people who have cancelled satellite TV service are willing to give you their dish and LNB for free if you remove it from their house. Again, make sure the hardware you get for "free" is compatible with your receiver.
The DirecTV dish is probably the easier of the two to point.
If you're looking for high-speed Internet at your campsite, you can usually package ISP services with TV services. There's a relatively new company, called Excede, launching a new satellite later this year - supposedly with unlimited 30-50 Mbps speeds. I have yet to try it (since the satellite has yet to be launched) so I can't vouch for the speeds. The nice thing about Excede (beyond the speeds, if they materialize) is that service isn't tied to TV service. In theory, you could stream any content available online, e.g. Netflix, with an Excede setup.
More questions. Feel free to ask.