If venting your batteries is a potential problem, you might want to give AMG batteries a thought. I have 5 AMG batteries and don't have to worry about venting them. Gives me a warm and fuzzy feeling to know I'm not corroding away my frame or going to blow it up when I turn my inverter on. Just a thought. They ARE more expensive.
I stuck with the 12vdc bats as a personal preference over the 6vdc units.
2013 Silverado 2500 HD Duramax/Allison Tuned
Aviator Wright Flyer #1919
"First In, Last Out". 11B4Y
DAV, MOPH, VFW, 5/7 Cav,1/8 Cav Assoc.
11th ABN Pathfinder Co. N7MIP