I haven't rolled them by a ton but they seem pretty sturdy and by far the best price I could find. I use 30 gallon plastic kegs which are way undersized but at a price I couldn't resist. It actually worked well because they're small enough to avoid hardware entirely so I don't have to worry about screws cutting into plastic, and the extra width at the base just makes them more durable. I put a piece of cardboard under the drum and filled every gap with a whole can of awesome stuff, essentially merging the drums with the carts.
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