I just purchased a 2006 Hummer H3. It did not come with a key for the cargo rails. Where is the best place to get one? The number on it is SP4.
I am also interested in putting a rooftop tent on my Hummer. Will the OEM cargo rails be okay to put one on or will I need to get something else? I am looking to get the Smittybilt Overlander which weighs 116lbs.

 

 

You can buy them on EBay. I'm not sure the load rating on the roof top rails will support much more than that.

 

Be careful what you buy on e-bay. Did a LOT of research on crossbars several years ago and here's what I found. Ebay 'aftermarkets' are rolled stainless steel and will support 150 lb. load. O.E.M. are 1/8" thick extruded aluminum and will support 250 lb. load.

 

O.E.M. rails are under rated! I have transported many loads from the home improvement centers over the years, on my oem rails. The heaviest load to date was a load of 12 sheets of drywall + lumber (approx 700lbs) and my rails are still intact and not bent. I don't understand why anyone would want to pitch a tent on the rails?

 

The OP is looking for keys to rails he currently owns, not new rails.

 

He was also questioning load capacity of the rails.

 

In the past I remember Tainter saying that if you are putting more than 200 lbs on the roof you want to remove the head liner and reinforce all of the roof track mounting areas because they are only rivnuts. There is a 200 lbs maximum counting a roof rack. Putting 700 pounds on the roof sounds like a risk of causing a roof leak in the future.

 

I have made more than a dozen hauls of 200+lbs on the roof, and never a problem and no leaks. Btw, the roof is designed to hold the weight of the vehicle in case it overturns. Last time I checked my H3 curb weight, it was well over 200lbs.

 

That may be true, but all it would take would be enough of a 'flex' to allow water to pass by the rivnut seat.