62''/1.6m Aluminum Tripod Detachable Monopod with Quick Release Plate, Ball Head and Compact Travel Carrying Bag K254A1+BH-28L (old model SA254M1)

SKU: KF09.084

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The ball head could be changed to other parts as long as it has a standard 1/4 screw mount.  
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Yes, there is a metal piece at the bottom center that you can probably hang a weight from.  
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The tripod leg is made of metal.  
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It comes with a carrying bag. easy to take with you when you go outside.  
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As long as the camera base has a standard 1/4 interface screw, the monopod could fit on the camera base.  
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To hold telephoto lens, it is recommended to use a tripod mount ring additionally for better balance. Meanwhile, it is better to hang some heavy thing to the hook to lower the center of gravity on this tripod to make it more sturdy and less prone to vibrations. 
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Maybe I got a lemon but I suggest you pony up the few extra bucks and buy a different one on here. If it is compatible it will break or fall over anyway. 
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Fully entend is 62 inch and 16 inch at is lowest and weight 3,5 pounds on my digital scale 
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Yes with the proper attachment on the gopro (threaded piece).