Indeed it’s very impressive how much they accomplished by themselves without the wheel, without big domesticated animals and without contact with other civilizations.
Related, I very much recommend the book "Mexico: From the Olmecs to the Aztecs".
They aren't super-great in hilly terrain, though.
Even navigating stairs with a dolly is easier than carrying a heavy weight, and much safer, too.
I'm utterly unconvinced by Jared Diamond's claim that lack of pack animals made the wheel irrelevant.
Oh, and any significant construction site would find it useful to make a road to it, even if they only were carrying things.
Even when barging heavy loads, to get the load off the barge and up to the site a dolly is still highly useful.
In any case, the baggage cart like you're describing, or maybe a hand truck, seem to be both artifacts coming out of industrialized society. I'm not sure how useful one would be on a steep hill if the cart itself, including the axle and wheels, were made of wood. You don't really see modern, usable baggage carts until the industrialized production of steel (I'd love to be corrected). Hand carts? Sure, but of a more significant weight:load ratio meant for longer distance, heavy load, flat hauling—remember these suckers often have brakes you wouldn't want to engage on a runaway cart, like a peg through the spoke or axle or a wedge under the wheels.
I'd think some kind of carrying + strap frame like you see today would be a better fit for personal hauling and balsa might even work well for it.
https://en.wikipedia.org/wiki/Ljubljana_Marshes_Wheel
Wheel & axle made of wood, for a two wheel push cart.
Spend some time using an ordinary dolly to move heavy boxes around, then try carrying them. There's just no comparison.
Besides, it's one thing to say that wheel technology is gated by metals technology, quite another to say it is gated by the existence of pack animals.
The axle is also very clearly a turned part, probably made on a lathe.
I’m pointing out projecting modern needs backwards out of speculation isn’t likely to yield much understanding of why someone didn’t invent a handcart in precolumbian mesoamerica. Jared Diamond at least compares the material conditions of the two sets of continents—that seems like a decent tactic for approaching the past, even if I do have large complaints with his confident narratives.
I've been to Chichen-Inza. It's flat.
The Egyptian chariots had wooden wheels and axles, and were light.
https://www.brown.edu/Departments/Joukowsky_Institute/course...
A rail road even. Dogs and goats are useful for pulling sleds over a rail. Or a trail.
I agree that the size of the animal doesn't makes wheels less worthwhile.
... by then. They could have had horses, camels, and various others: https://en.wikipedia.org/wiki/List_of_North_American_animals...
People who live in Peru and study the ruins distinguish three megalithic stonework traditions, with the Inka the least sophisticated. The Inka's predecessors routinely handled rocks of tens, and up to hundreds of tons, slicing them into non-convex polygonal shapes and fitting them like puzzle pieces. The Inka worked only much smaller rocks.
Originally, the king was the Inka. No name for the civilization he ruled has surfaced.
The sailbarrow has a large central wheel that bears the weight, relieving the human of the need to personally support the weight of whatever's being carried.
I'm no expert on international wheelbarrow histories, but assume that the term "sailbarrow" being so general applies to any wheelbarrow having a sail. The historic precedent of the Chinese incarnation is literally their conventional wheelbarrow with a sail added.
I assume the same approach can be (and probably has been) used on any wheelbarrow in appropriate conditions.
Were they really walking around the tropical jungles of Mexico?
It is also worth pondering why wheel+axle was invented so late even in Eurasia (after bronze alloys were invented and adopted, only around 5.5 kya, many thousands of years after agriculture).
This fact has changed my perspective on how much infrastructure already must exist to enable large wheels that rotate smoothly around an axis. Knowing that, it is no longer shocking that one might make toy wheels, and never scale them up to large ones.
Notable exceptions from the PIE family are semitic languages, and Hungarian, Basque, and Finnish.