I have the same need for internet service while travelling in my coach. I just received an email update from Dish Network, which indicated that starting late this month they will be offering satellite internet service without the need for a telephone line. You can visit their site at:
www.starband.com . After visiting their site, I read that satellite service is not available at this time. But we should keep checking their site for updates for their service. Also, look into internet service provided through cellular antenna. Look at
www.goamerica.com . They offer unlimited internet service for $59.95 per month via cellular antenna. A special pcmcia card with an antenna is required, which can be bought from them. The only fall back is the service is only available while in major cities. If you have any new information please post it or email me please. I hope they figure this stuff out soon.