I added a few more things to the van over the last week:
First is a pin for the aluminess bumper swing arms.
I couldn't find a pin that was the right diameter, but that wasn't excessively large or long. So I bought a smaller pin and used some heat shrink to build it up to the right diameter. It's actually a very snug fit and doesn't rattle at all which is nice. It seriously adds a lot of strength to the swing arms.
I also ditched the aluminess tray in favor of a pelican 1690 case that I scored off amazon. I got it for $200 with free shipping! The retailer had it listed as used but in new condition and with a small (less than 1") mark on it... Well it was brand new when it arrived! Only the cardboard box was dinged and beat but the pelican looks brand new! I stripped off the retracting handle and the wheels and pulled all the foam out from inside it. I'll list those things on kijiji to cover some of my costs of the case.
To mount it, I used some scrap aluminum plate I had at work. We use it to mount instruments to and we always have piles of it laying around.
1/4" thick. Dimensions are 25.25" wide and 29.5" high (from very bottom to very top of the tabs). I have the full drawing with all the dimensions if anyone is interested.
Case mounts up like a dream. Nice and solid. I'll likely mount my fiskars axe and a shovel to the backside of this plate using some quickfists.
This case is the perfect size for my bbq and stove and can still fit a TON of stuff inside. I'll probably build some shelves inside it.