Thought I'd share this Vin to RPO decoder
It tells you what your hummer came with from the factory.

VIN to RPO decoder

 

dont have mine!, did i think it would,,,oh ,what is rpo

 

RPO codes are the equipment codes the factory uses and are unique to each vehicle.
Here's my 2007
As more and more people do VIN search the rarity of our hummers will start to show.
Not sure why your VIN didn't show anything, try it again and make sure the numbers are right is all I can say

 

My VIN didn't come up w/anything either. It is a 2010 but it's a year old now. You'd think they'd have it in their DB.

- Jason

 

Here is the info I got back
What a relief to know it was made in 07, sic.

 

Well you still have the RPO codes There's a small sticker in the glove box with them.
Here's a link to all the codesHummer H3 RPO Codes

 

My 06 came up but my 08 and 10 did not. Thanks for the codes.

 

I still have the window sticker. Would the RPO tell me any more than the window sticker?

 

My 08 did not come up