From one of the reviews:
"The bag is a rather useless object. It is made out of robust waterproof cloth but offers no way to close it from the top. Thus it is useless in keeping camping gear dry during the rain. I received a wheel and one of the bearings was already bad. Welding quality is terrible - I hope that this trailer does not fall apart on the C and O canal. Little tip - there is a hinge and I placed two stick and peel rubber feet in the gap of that hinge to keep it springloaded and to keep the frame from flexing around. There is a lot of play in the assembled frame. I used the bold that they provided for the fender to hold it together. Locks that hold everything to the rear wheel of the bicycle could use longer bolts. Floor of the trailer came with a huge nick that I would need to hammer out and then spray paint."
Does that wheel have a QR? Can't tell from the photo. And don't forget a 16" replacement tube, or at least a patch kit.