I've enjoyed all the battery threads lately. I've got a question that involves venting multiple batteries. I'm curious as to how 5th wheel owners that add one or more batteries in the front pass through storage set up a venting system. I would like to add an additional 12v battery, or maybe go with 2 X 6 volt batteries, and I'm wondering if I can just get another battery case, cut an opening in the top of it, and then "Y' into the existing vent hose. Suggestions and/or pictures would be great.