Many many have such systems. NOTE that it can often do eithe rDish or DirecTV with the proper modification.
Datastorm Users - The Premier Site For Mobile Satellite Internet and TV
Is the place to go for more information:
Last I checked the subscription was either 60 0f 70 per month. (the extra 10 bucks gets you way better customer support) you can also go to
http://www.motosat.com For more information, user manuals and such on your system.
Normally this uses Hughesnet 2-way satellite internet.. I would recommend you try 2-way satellite before you subscribe.. The first URL you can likely connect with someone who uses it. Several RV parks also use 2-way Satellite including most Thousand Trails parks.. TT parks are now open to the public. THey use Verizon not Hughes, but the issues are... Much alike.
Not all people like 2-way Sat service. I .. Well, It's not as good as cable, but it's better than cellular in many cases (not all)