Noting your state, mind if I ask where you're getting the container from? I ran into a place in northern Vermont called Moe's that sells 20' containers for $5300. Once I get the new house situated(foundation isn't poured yet), I'll probably buy a couple.
As far as wood storage, the air flow thing has already been hit. Unless you put bone dry wood in there, you'll probably see mold. Heck, here at the place I'm renting the wood storage is open on three sides and it will still get moldy in the back. I'm going to end up building something like
this.
I would cut up and scrap your box truck, but that just me.