Here are pics of the battery
box I set up for my Bigfoot
17. I found a plastic box made for boats, designed to fit 2 T-105 batteries, then made this bracket for it out of angle iron and flat bars. It bolts down at the corners, but that alone didn't seem adequately secure for driving or theft, so I welded up a retaining strap out of flat bar and hinges. This was the lightest, most minimal design I could come up with.
I still have to add a lock and bolt the plastic box down and paint
the steel bracket. I also think I'll need to block off all the access notches on the box. I'm thinking of folding some innertube rubber over them and securing with pop rivets, or something along those lines.