Hi
Assuming the Tab pro does not have mobile data, then you would need to tether it to wifi from a mobile phone. (The phone uses mobile data and relays it over wifi) This would of course use up data on your phones data plan. You would need to be somewhere with decent mobile data reception. Whether you can actually do this depends on the phone and whether your carrier allows it.
or
Find sites with wifi available!
or
If you feel richish, install a satellite dish on your caravan and receive internet over a sat link.
Roger