interior vented battery box

[wheelerimage]

Hello,

The battery in my 65 Globetrotter is under the goucho. There is no box. I wonder if I should be worried about that. Exploding gasses etc. I have seen battery boxes in the forums, but they seem to be made to go outside the trailer. Usually on the tongue. I have my spare tire and propane tanks on the tongue. No room there for a battery.

Is there a battery box that is made to go inside the trailer. How should I vent it?

Also, I was thinking of adding a 2nd battery because i frequently boondock.

Someone out there must have found a great solution to this problem.