I don't know if the reviews here are for every model or if the product has been improved. The wheels securely connect and i don't see how the pins could come off. Also, the wheels are well behind the handle support so how could objects you are carrying hit the wheels. The foam filled wheels are pretty heavy and the car is very stable? I am not sure how people claim it falls over while loading? The car was super easy to put together, is very solid and easy to secure. Again this is for the 12\" foam wheels, 29.9\" x 15.4 deck.