I have seen these in my local RV shop. kind of expensive.. I had lock brackets put over my boxes. to secure... will the off gassing of the batteries degrade the finish on the box, causing holes... if battery acid will wreck havoc on support arms in vehicles... I'd be concerned in there too.
I honestly would like to see this compartment built into the trailer.. a cutout in the tonge area, pull out tray, sealed from interior but vented outside... so you could put 4 batteries... whatever flavor... if they can do it with 2 - 30lb propane cylinders... batteries should be easy
