Dude that is a great looking rack!...but remember to be cautious with the how much weight you bolt to the roof rails, especially if you are flexing the truck when wheeling, (we all know that never happens!). There are several threads on failed H3 roof supports, on various Hummer forums, and it ain't easy to fix. A bad-ass roof rack might hold 500lbs but, the gutter rails on the truck will only hold 200lbs or so. Also...don't forget that "static weight" is not the same as "inertia weight", and slamming on the brakes with 200lbs of roof rack can turn into 1000lbs of force pulling upward on the roof rails. I've seen some photos of H3's laden with all all kinds of roof cargo (spare tires, tools, etc.) and I would never put that much weight up there. Those ammo boxes are a great idea...but, be careful what you stow inside em. Here's what happens when you overload a H3 roof-rack (from Nugget's truck)...
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The H3 roof is made from very thin, flemsy, sheetmetal...regardless of what rack you use. At first you might think adding more mounting feet to your rack would spread load and make it last longer. However, this doesn't matter because the part that fails is actually below the mounting channel. I cannot think of a cheap or simple way to reinforce the roof rails without it being a major project. I think this is why the original BA roof rack was made from aluminum...its inherently weaker and therefore people won't be tempted to overload it. With advent of steel Gobi racks and custom steel racks (obviously much stronger)...you're first impression might be to throw a rick of firewood up there! Few people stop to realize what their super-strong, welded-steel, heavy-duty, roof rack is actually bolted to. Its tin-foil. So go easy on it.
Still a bad-ass rack. Great job.