The total evidence for wheels is one toy (as far as I know). As for wheel use without draft animals, that's why the wheelbarrow and handcart were invented.
Yes, you have seen that toy - but that one toy clearly shows that the concept of the wheel was not beyond at least the Maya. Furthermore, the Mayan temples were "earthquake-proofed" by the use of cylindrical wheels which would allow the pyramid to roll from side to side during an earthquake.
But the biggest reason the wheel didn't take more was because the "wheel" was the symbol of the Mayan cosmos and their calender. It wasn't that they did not know of the wheel - it was their most sacred religious symbol. Use of the wheel was confined to only a spiritual purpose. Just another example of superstition clouding progress. But also, it was only the Maya who had this technology - as far as I know the Aztecs did not "know of" the wheel nor did the Incas.