Based on the types of failures I've seen from other users over the years and common sense, the majority of the failures result from the carts not being completely inserted into the scuppers. Loading the cart in that manner places a lot of localized leverage on the scupper. If used properly on kayaks with reinforced scuppers you shouldn't anticipate any failures.
On a related note, a damaged scupper is one of the most difficult things to repair on a kayak. Most shops, understandably so, aren't even willing to address it since the success rate is so low.
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