im from CACH, i wouldnt be able to load package cars. at Cach we load like this
1. start wall/first "shelf" 30 feet from last wall.
2. continue to build up said wall. Then start throwing a bunch of packages behind that wall.
3. continue building the wall.
4. continue throwing packages behind the wall.
5. repeat until you get to the end of the trailer.
6. throw the rest of the packages at your final wall to make it look as ugly as possible and stack bulk packages in most hazardous way so it surely will crush the next person who has to open that trailers door.
7. profit