Anyone out ther a thrower for unloading a truck? I seem to get through smaller trucks just fine, but recently I've started to get pain in my upper and lower back as I reach the last panel of a larger truck. Have any of you expierenced this, and if so, what have you done to make it better? I try lifting with my knees but sometimes you just can't when you're rushing. The pain also starts slowing me down, especially with heavier items