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I have a Blackburn rack on my mountain bike. I think it's almost indestructable, but if you're carrying so much your rack might break, other parts will probably let go too!
(Like your knees, your lungs, your rear hub...)
So if you can manage the weight, any sturdy rack should be up to it. 55 pounds is quite a lot (that's about a third of my body weight, which I wouldn't want to hang on the back of my bike).
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