We already get spent grain in 1000 pound totes, trucking them in ourselves from a nearby city. It takes time, and if I bring a trailer to a farm or supplier, I can pickup 3.5 tons at once, and save both money and a lot of time, even after you factor in our cost of hauling them directly farm a distant farm directly to our farm. In the summer, during the height of the growing season, we don't have time to get the 1000 pound totes every 2 - 2.5 months. We also have issues with mice and since our place is a stop by place, and it's imperative we keep mice out of crops, and any produce, we are at the point where we need a 4 ton bin. I'm still looking at building the bins from plans I found on the lasstate.edu site.