I drive a transport milk truck. An 18 wheeler that loads the small milk trucks you see. I drive over 3 hours and then unload my trailer (usually 1200 cases) onto the small trucks. The cases are stacked 5 or 6 high and I use a hook to drags them. A stack can weigh from 50 to 200 pounds. 12 to 14 hour days but the temp is always about 34 degrees in the trailer. Thats "cool" in the summer but "warm" on cold winter days..............Squire