brulaz wrote:
I had two batteries in two boxes for several years.
Never a problem.
However any enclosed space should have *some* ventilation to get rid of hydrogen gas.
"Enclosed" may be a misnomer. Looking at pics of the OP's trailer suggests his battery storage area which is hidden behind a removable panel on the trailer's front cap is probably much the same as the removable panel on my previous KZ Spree, behind which sat a pair of 30 lb propane tanks. Yes, that compartment was "enclosed" but it certainly wasn't sealed but rather was a molded space, part of the trailer's front cap - so whether used for storing tanks or batteries that area was
not part of the trailer's front pass through cargo compartment but was in fact a separate compartment with plenty of ventilation. Unfortunately the OP hasn't provided any pics of this "enclosed" battery space but I'd suspect he doesn't need battery boxes at all.