Egan,
As far as the roof rack goes, I have posted this info before on here, so I found it and copied it to this thread............
The H2 roof rack locks are made by Thule. I just ordered a spare key for my H2 in case I lose it or break it. You can call them and order it or just go to their website at www.thule.com.
Their key numbers closely match the Hummers as Thules uses an "N" series while Hummers use the "E" series. So Thules N003 is the same as our E003 key. Thier cost was only around $2.50 each.
Hope this helps.