While these products are of low cost, you pay for it with no support, in an beyond the "warranty' period, more on that later. I ordered a bicycle cargo trailer and it arrived without the wheel skewers. There was no bill of materials and they did not understand what a BOM was. I don't think it existed, ever. So I could not check the shipping box to make sure I received everything I needed. All they could do was send pics of a fully assembled wheel, which I was expected to have sufficient product knowledge to deconstruct and reply back what was needed. It took nearly 10 email exchanges, across a language barrier, before they would guess what was missing and sent two complete wheels. The parts I needed were in the parcel, in a pink pouch. That had the skewers, a wrench, and some misc hardware. This pouch was never identified with the assembly guide. It would have saved a lot of aggravation if they devoted a penny to add the BOM to the product guide. I put the trailer into operation with the skewers and had my next problem. At the factory, ALL the nuts were put on finger tight on the bolts. I didn't discover this until using the trailer and hauling groceries back from the store. The main bolt that holds the tow arm in place lost its nut and the bolt eventually fell out. This cause the whole trailer to pitch back and tilt to the rear while I was moving at a good clip. I always try to balance the payload over the axels. I reacted to this by breaking hard, this caused the load to pitch forward HARD and the bed of the trailer hit the tow arm and put a crease in the top of the tube. I salvaged the situation by moving the spring pins around and scavaging stuff from the side of the road and found a lag bolt to fill the hole. I sent Aosom the pics of the damaged arm and bolts from all over the trailer that was never tightened. Instead of sending a replacement arm and nut/bolt they refunded the purchase and instructed me to donate the trailer. This is when I discovered a disturbing Aosom position, not indicated in any public facing document or on their website. I attempted to pay for a new tow bar. However, since I was "out of warranty" because they refunded the purchase, I could not obtain ANY parts from them. They would not even sell me a spoke, tire or a complete wheel. Not only that, Aosom would not tell me any specifications so that I could find the parts independently. I don't think they know and they don't have the capacity to contact their own factories for information. Aosom manufactures many of the products they sell. So be aware that the lack of support that Aosom provides, means you may be disposing of an otherwise serviceable purchase prematurely because Aosom will not support or provide parts. This is not the strategy of a company with any notions of sustainability.