A lot of good suggestions for streaming options, but if you're just looking for local (to current location) TV channels for weather/news, then all you need is a portable TV Tuner.
(Here's an example of one:
Best Buy TV Tuner)
Plug this into your USB on your computer or laptop (whichever you bring with you), connect the cable to the trailer's TV antenna and then you can watch the local over the air stations using your computer's screen. No streaming or internet required.