Great pay and benefits! Such a good workout you can quit the gym!

What’s the difference between a preloader and a sorter? I’m applying for a warehouse job and the company has these two positions available in my town. I was thinking about applying for both but I don’t want to give managers the impression that I don’t know what I want. The online job descriptions don’t provide enough detail. My goal is to get in my application as soon as possible so I welcome any help.Thanks