I'm not actually a "snowbird", but we do go back and forth from home to our summer place quite a bit. I guess my best suggestion would be to keep a list of the items you need to take back and forth, and maybe a gift list for friends and family of the things you'd like to have two of. When you think of something you wish you had, put it on the list to bring back next time. You could have a box or suitcase to transport all the items, and keep the list there for packing.
Welcome to the board from another Pacific NWerner.