Heh... as an electronics hardware professional, and as a Amateur Radio (Ham) hobbyist for decades, I can appriciate the chunk of learning curve there!
Couple of questions, comments...
"A booster" is this a amplifier/unit that recieves cell signal and rebroadcasts it as cell? Or whats known as a LNA, that goes between an antennna and a radio? Usually the latter is built in. Id think you would want to avoid the former, altogether.
Best practices would probably be... a decent gain antenna (probably directional) on a good cell signal reciever, with little to no coax between radio and antenna. Output of cell RX, hopefully ethernet, down to your classic, standard OpenWrt router/AP, just like you'd have for home, providing your campsite wireless AP. Tada, done!
Now, I have no idea of the market, what kind of gear is out there, but thats the shape of what you want to do.
Practical tips.. dont get TOO directional of an antenna... that awesome 27 dB gain might sound nice, but it will have a very tight beam, and could be a real pain to aim easily... lower gain will have a wider pattern.
And setup for that aiming, you might think about some kind of pole mounting, so you can point it easily and reliably in the best direction from your campsite, once you arrive. Lastly, most campers are aluminum lined boxes (not all), you might want to think about how to window mount your wifi unit or otherwise provide outside setup.
Sounds like a fun project!