Extra storage on the tongue.
I saw this on YouTube and I decided to do it. I don't boondock (yet) so I don't need a second battery. I had to move the original battery over to make room but the new box fits like a glove. ...
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Pretty ingenious idea. On my battery boxes I tool a small piece of black duct tape and plugged those top vent holes. Otherwise rainwater running off the roof fills the boxes up.
