I'm guessing you plan to build out the new box prior to attaching it to the truck???
Where's the box pictures. I love the race photos.
Well I know with your skills and vision it will be great. The Doc gave me a road block in my build so I have to live threw yours at the moment.
If you are going to repair a tire in the field, any balancing that was done is now compromised. Fixing a flat and then hitting the pavement for a couple hundred miles with an out of balance condition will kill your tire. I HATE! wheel weights but thankfully there is an awesome solution to this problem. I use Centramatic dynamic wheel balancers. It does not matter what the balance on the wheel and tire is, the Centramatic Dynamic balancers will make the wheel run smooth and true. They mount between the hub and the wheel. The minute I drove with the Centramatics I could feel the difference! If you hate wheel weights like me and want to get the most mileage out of your tires, wheel bearings, etc. you should check out Centramatic. I run the Centramatics and NO wheel weights.
I've researched the dynamic balancing solutions that use medium inside the actual tire, but have never seen these. I'm also running beadlocks for field serviceability (Hutchinson border patrol takeoffs with a Dana 60/14BFF axles) and hadn't really come up with a balancing solution I liked. Currently I've just got standard rim weights.
Do these Centramatic balancers mount between the rim and the hub? If they fit inside the 16" rims I've got, I'm sold. Did you go through a local dealer to get them, or should I get in contact with Centramatic directly?
Dig your project, your mentality and your work; have seen your shots around the web for a few years now. Hope to run into you on the road at some point.