I have been lucky enough to go up North every year for over 20 years. I bottom bash off the main boat. I take a large Penn egg beater with 50lb braid. A large Alvey spooled with 80lb mono. A large overhead spooled with 50lb mono for Spaniards. A smaller egg beater with 40lb braid. A spool of Scheinder 50lb for leaders, Gang hooks, 80lb steel leader, balloons, 6/0, 8/0 hooks, good quality swivels, squid jigs and a pair large long neck pliers. If you are gong with mates you can cut back on some of the gear and share your gear for Spaniards. The rods I take vary from 10kgs to 25kgs.
And not to forget a must have, a couple bottles of port.
Enjoy your experience. I hope you get a gun skipper and deckies. They are the blokes that can make or break your trip.