I'd probably go for a speed graphic too for day use. If you ruin it (you probably won't), you're out $100-300. Lots of the wide lenses have big rear elements and you would probably not be able to fold up the camera without removing the lens. I'd like to know what's available for "press" style short lenses to avoid this.
I'd have a DSLR or bright 35mm system for night use. Fishing is far from a 9-5 job.
Focusing won't be a big deal as you'll probably stay put and out of the way of immediate danger photographing the fishing action, and many of the people on deck have particular locations for particular jobs, which are also somewhat repetitive, so you can prefocus and wait for the excitement.
I'd mail/fedex/UPS the film back in batches. Airport carryon Xrays are less problematic in my opinion than the TSA manual inspectors/swabbers. "What's in this 4x5x1 box the photographer really doesn't want opened? Film comes in rolls, not boxes."