That is too strange. It seems like the dealers install whatever they want. I hope all the hitches pictured for the '05s are 6500lbs. All the documentation says they are, but have the disclaimer "when properly equiped". So how do you know if you are properly equiped? I crawled under mine and there is no load rating that I could see stamped on the unit (which is also strange, you usually have a load rating and tounge weight stamped on the receiver).
I tow a 5500 lbs trailer. I was able to pull it fine with my BMW X5 which had a tow rating of 5000 (but BMW way over-engineers their vehicles, I knew a guy that was towing an 8200 lbs Airstream with his). However, I like the extra capability that one is suppose to have with the GX, gives you that extra towing cushion when conditions get harsh (hot, wind, hills). I have a few more mile to go on break-in before I can start towing. I guess if the hitch falls off, we know it was the 5000 version and not the 6500.
Donger
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