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A Smarter Design for a Wheelbarrow: The Multifunctional Worx Aerocart
As an ID person, you're actually being kind of irresponsible to so glibly trash talk the design of something that you are mis-using. Wheelbarrow design doesn't suck, in fact it's design perfection -- simple, reliable, easy-to-use, cheap, etc. Your problem is mis-application. Wheelbarrows are not for carrying cages, wood, etc. They are for soil, sand, gravel, etc.
I have the same yard cart as you. It's been a real back saver.
The superior wheelbarrow design already exists, it's the Chinese wheelbarrow, which evolved to deal with China's decaying road network, as explained in this fascinating article:
While the Aerocart has many thoughtful and well-designed features, there are reasons why the single-wheeled version has persisted. Traversing across even a gentle slope is nigh impossible with a two-wheeled cart or barrow as the load's center of gravity will be shifted far enough downslope that it will spill (The tippy-ness of a traditional wheelbarrow in this situation is disingenuously depicted at 1:26 in the video, where the users is incorrectly lifting the load with a bent back, causing it not to be raised high enough for the uphill leg to clear the ground.) The other reason to go with one-wheeled design is that it makes it easy to lay a path of planks over soft earth or even to bridge a gap. In my opinion, the traditional wheelbarrow is meant to be battered and abused until repairs are no longer viable. I may get an Aerocart for its useful features, but I doubt that I will ever be mixing concrete in it.
I have had one for two years. Is it 8-in-one? Meh. I have used it (with bungee cords) to move heavy plant pots, as a dolly, to distribute probably more than 50 yards of mulch, compost or cut sod, and tried to use it in a few other cases.
Like: While the tub is much smaller than a typical wheelbarrow, it is just the right size tub where a wheelbarrow's single wheel would leave nasty ruts, and it stores nicely in the dolly position.
Dislike: The dolly foot joint gets clogged with debris making it hard to flip out, and the arm that flips out for hauling boulders wiggles making an annoying sound - solved by leaving the bungee cord on it.
Conclusion: While it has a few other features that most might not ever use, it is a great small tub wheelbarrow that can be converted to a hand-truck, and works well enough in both cases for most uses. It is not likely a good replacement for a yard cart to haul wood or large tub wheelbarrow for large amounts of light stuff.