From an article in 2008:
As Detroit feels the noose around its neck, everyone says it's getting what it deserves for years of crappy cars. And it is. But you wouldn't know it by looking at the new Dodge Ram, which is replete with more tech toys than most luxury sedans. The crowning feature: the truck can serve as a mobile WiFi hotspot and link multiple computers or phones to the Internet.
Dodge's New Ram Is a WiFi Hotspot, Too? | Fast Company
It sports a 3G wireless EVDO connection to Chryslerâ€™s UConnect mobile Internet service (see more in RAIN here) and a router that turns the truck into a 100-foot radius Internet hotspot, even while chugging down the road. That means a broadband connection (well, 400-800Kbps) to computers and any other WiFi devices in the car. And that means, of course, mobile Internet radio. UConnect is also Bluetooth-equipped, which allows phone calls via the navigation system. A UConnect susbscription is $29/month.
RAIN 12/16: New Dodge pickup sports mobile WiFi (and thus, mobile Net radio!)
I've never heard or seen mobile satellite internet service even existing. From a technical standpoint, it's not feasable with today's technology.
You haven't looked.
Mobile Satellite Internet & Phone Solutions for cars-trucks-RVs
Mobile Satellite Internet | Mobile Satellite Internet Systems | Satellite Systems
Satellite Internet and TV for mobile users
Portable and Mobile Satellite Internet Solutions - Skycasters
RV Satellite Internet? Try Autonet Mobile Internet - PPL Motor Homes
Uconnect | Wi-Fi | In-car Wi-fi Connections