Thank you both for such great responses!
If they drop a container, how do I ensure they are paying me fairly? And I was planning on holding off on loads until I could make a full trailer trip in. His problem was initially getting anyone to even think of coming for his old bent silos, and no scrapyard would come because of the distance... but our trailer (used for hauling round bales) is capable of towing 15k lbs. Surely I could make a well loaded trailer profitable?