Gorilla Carts, which holds the distinction of designing the number one model on this list, addressed a question that could come into play for you. When you order online, you always take the chance of your product arriving with damage or missing parts. That is just the way it is and unfortunately, there is little to nothing you can do about it. Really, and Gorilla Carts answered this themselves, all you really can do is get in contact with the seller and/or the manufacturer.
If it is under warranty, that is even better as you should be covered that way. However, some companies, such as Gorilla Carts, will allow you to submit a warranty claim. Either way, you go, it is essential that you get ahold of the proper authorities and as quickly as you can.