I had a spare 620mm carbon fiber handlebar (130 grams) I decided to test against a 5000 lb. F-150. I didn't know exactly what to expect. I decided to use the front tire, since that's where the engine and most of the weight of the vehicle.

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Other than a few minor cosmetic scratches from burying itself into the gravel driveway, the bar is completely intact with no visible damage.

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So, I decided to make a test a little tougher by turning the 2x4 on it's edge and rocking back and forth on top of the bar.

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The bar is completely supporting the drivers side front tire of the vehicle.

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The bar actually dug a small trench into a very hard gravel driveway.

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Other than a few more scratches from the gravel, the bar is intact, perfectly shaped and shows no damage at all.

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After a quick rinse and wipe it still looks new. 

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Draw to your own conclusions.

But after conducting this test, I don't think you have to worry about it. But I am curious as to how much abuse it will take. 

I haven't tried the same test with an aluminum bar, but I might do an update soon. 

I'm open to trying more experiments if anybody has any suggestions. Maybe I'll use it for target practice.