Hello...
You can go with like CRICKET or Sierra for internet which is a month to month or by data purchase pay as you go plans. BE sure to check coverage areas.
http://3gstore.com/index.php?main_page=index&cPath=318 (Sierra)
http://www.mycricket.com/broadband/ (Cricket)
If you want WiFi in the coach, then you can plug in either of the above to the below device and then you can use WiFi like you would at home or a hotel or what have you. It just makes your USB Celluar data modem as the connection to the net and gives you WiFi for more than one user at a time. The only way to go.
http://3gstore.com/index.php?main_page= ... cts_id=610
Hope this helps.