Easiest thing to do is to hit the disconnect and then use an ampmeter to check if there's any residual draw. Most likely you won't find any and therefore won't have anything to worry about. Your batteries will be fine for 3-4 weeks like that. As long as they're fully charged when you put it in storage.
Now if you find you do have a drain, then it's time to be concerned, as those parasites can kill your batteries quickly. You could go around and identify which circuits are still live to try to figure it out, but the easiest thing would be to just install another disconnect right at the battery bank.
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