The dealer can tell you any darned fool thing they want. And, they do. And then they'll fail to stand behind what they said.
You'll just have to take it on the chin this time. The case's primary function is to catch any acid that leaks out of your battery, and they often do a poor job of keeping rain out. The hole drilling option is a good one.
Also, as has been stated, if you're storing for an extended period of time, take the batteries home. The dealer might want to paint a rosier picture of leaving them on the RV, but the tend to be truth-challenged.
At least, now you know.
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