There is a companty called "Container Store". I buy bins, boxes and stuff from ours regularly. The key thing is that with a selection of, well, just containers, you will probably find something pretty close to what you want.
I don't work for them. I don't own stock. I have no skin in this other than to see a trailer work as intended.
Myself, I'm about to have to build an off road trailer capable of hauling 6 foot sections of one foot diameter logs as we cut down trees. So trailers, wagons, heavy lift capacity is interesting to me.