I finally made a decision regarding my wireless internet service. Since that truckstop chain has placed a bandwidth limit on their service I just signed up with Cingular for their wireless internet service. I'm trying it now as I type this.
While the card wass rather expensive at $200, and the service itself is also a little pricey at $60/month, at least I won't be restricted to just getting service at a certain truckstop chain but rather will have service wherever I can get a Cingular signal. As they have quite good coverage, that will be most anywhere I happen to be. As my company cell phone is on Cingular I know from experience that it's rare that I won't have a signal.
I'm pretty impressed with the speed so far. Web pages load very fast. It seems quite comparable to wifi service, at least at my current location.
I have 30 days to try it out to see if I like it. I can choose to cancel during that time without any penalty. I'm pretty happy with this first use, but time will tell.