Re: Adding Under-Belly Storage
Those job boxes look like normal pick-up truck tool boxes. Having had a few of those, in general they don't all have the greatest, most durable latching mechanisms, since they're made to open from the top. Under a skoolie, it'll open to the side. Don't want gear inside bouncing around causing it to open on the road. Also they're usually ribbed on the base for strength and support, not the side, which will now be the base. I think the cheaper ones may distort. There's a HUGE variance in quality in these boxes, and I don't think all will hold up the same in your application. Make sure they're supported O.K. Maybe some all-thread down thru all 4 corners bolted to 2 angle irons along the length? Also, watch how the lid opens- most will need extra clearance for the lid when opened. Check this out BEFORE you bolt it up!!!! I've mounted at least one too close to the front of the truck bed, and sure enough, didn't open.
A truck wrecking yard may have real truck boxes, which were made for exactly the application.