Bests & Worsts Reviews from Amazon

This product is rated for 400 pounds on four wheels I bought this product to cart my music equipment around including a PA system that I bought in the same order One of the wheels the casters specifically broke already because there were very cheaply made plastic they should be up in steal orrubber there's no way that I exceeded the weight requirement not even by half now I don't know what to do I can't send it back because I don't have the packaging and I have to re-engineer myself and fix it