My job requires me to move about 5-10 GB of data every weekend, and I've had great luck with the verizon 3G data card. I previously had the sprint service (not bad) and the AT&T which was a joke. I have heard from one of my employees that the new 3G sprint network is as good as the verizon.
Having said that, I always try to find a campground with wifi when I can. Unfortunately, it usually does not work very well, but if I find a place where it does, I will make a note and try to return there. There are plenty of other free or paid places you can hook up too, starbucks, flying j, etc. I saw several gas stations advertise free wifi just today, and think that it will be more common as time goes on.
My main "mobile office" is a Gulfstream sprinter van conversion, but we also have a 23" CCD. Both are outfitted with everything I need, which is my laptop, plus a laser printer, fedex and ups supplies, blank CDs and DVDs, and spiral binding gear. If I'm traveling alone I use the sprinter, but if my family is coming along we take the airstream. Since I travel about 40 weeks each year, this has allowed me to spend about an extra month with my wife and kids each year.
One thing that I would add as a very useful addition to the mobile office is a UPS/power conditioner. If you buy a large unit, it will stabilize the voltage going to your computer, protect you from spikes, let you back up when the power fails, and most importantly, run your laptop on AC for hours - so even when you are not on AC, you can work all day and not drain your coach batteries with an inverter. Very useful IMO. Just leave it plugged in when you are hooked up to shore power and it will charge right back up.
Mike
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