I am preload and it is coming man. I know at our facility, they ask the preload before anyone, then call the helpers. I have my own business and only there part time, but wanted to do it to see what it was like. It was boring, but man I was as sore, if not more, than my first day or preload. Mad props to those drivers that do it every single day. I know its like anything else, get some reps in and muscle memory. It was real and it was fun, but not real fun.
Give it another week and you will be busting your butt man!