Sealed battery boxes?

[philofab]

I need to mount a battery inside the cab of my Blazer. Before I spend time building a box from sheet metal and Polycarbonate is there anything on the market I can just buy that's not janky like the marine boxes?

I'm open on group size, battery will be AGM but not a Optima. Leaning toward a group 48 right now. Most likely get mounted on the passenger side behind the seat, below the side window (That's where it was when I bought it).

 

[PoorPetrie]

The only ones Ive seen are the ones for RVs and boats. I havent looked too deep into them though. Id just make one to fit your space