Andrew, you can get LED/LCD HDTV's that are 12v powered and low power consumption, or like we plan, just used a small inverter to supply the AC that our inexpensive small HDTV requires. Streaming video is pretty data intensive, probably averaging 1GB per hour for a HD quality. The other factor is going to be if you will be in places where the cell signal is strong enough, then you start needing to look into cell boosters if you camp in places with weak cell signals.
Everything is possible and there are lots of threads here about various aspects of what you may or may not want. If you use the Search feature, you can probably find a lot of your questions already have answers. If you search and can't find your answers, there are lot of folks who have probably already done what you want to do and can help.
Welcome and congratulations on owning a 19!
Eric (and Mary who is in no way responsible for anything stupid I post)
"Beware of false knowledge; it is more dangerous than ignorance." George Bernard Shaw