cell phones and truck stops
Just returned from a two-month run, from the East Coast to Seattle and back again. My experience with cell coverage, using an inexpensive ($50) dual-mode Kyocera phone (QCP 2035a) was excellent. Coverage almost everywhere, digital about 80 percent of the time, a bit higher near the Interstate (I did have analog coverage in large areas including southern Utah, and the Oregon coast.) I use the phone with Verizon's modem connection kit (about $70, I seem to remember) with excellent results.
Truck stop suggestion: If you're looking for a stop where you can plug in using your laptop and analog modem, the Pilot chain was the most helpful to me. I don't think I ran into one that didn't offer a data jack. Love's, Flying J, TA, Conoco and other truck stops were a crap shoot, but Pilot came through consistently. Kudos.
Don't be misled by the advertising!
Lisa,
The primary reason that Verizon is reluctant to provide coverage maps is the relative scarcity of the coverage. Plus, no one is ever going to be able to connect at 19.2K using the current technology. 12K up to 16K is reasonable as long as the caller is near a network hub.
For much of the area you are planning to travel in -- you are not going to achieve data rates in excess of 9.6K as long as you are in a wireless mode unless you use one of the satellite systems.
The mobile office is a re-worked of current digital systems and the backbone does not extend much beyond the center of major urban areas.
RW