Do you have a refrigerator or a separate (large) amp for the radio? If neither, then I'd just bring the jumper pack (as a backup in the unlikely event of a battery drain).
If you have those items, then I'd install a second house battery and move the 12V main wire to it. That way you run down the house battery, not the starter.
I don't like the A/B/Both switches, because I always forget to switch and end up draining both. I prefer the Engine/House automatic cluster. This keeps the wiring separate, and charges both, and allows me to combine both if needed.
Something like this:
https://www.bluesea.com/products/808...nagement_Panel
or this:
http://www.marinco.com/en/716-sq-140a-dvsr