There is a damn forklift sitting six feet away.
Take the load off the pallet jack, drive the forklift up to the back of the truck, slide the forks together and lift the forks up until they are even with the floor, directly behind the pallet jack. Pull back on the pallet jack to roll it out and slide it onto the forks then set it off to the side. Then use the damn forklift to pick the load up just enough to back up with it a little until the load is even with the end of the truck bed. Drive in and pick it up, back out and set the load down.
How fucking hard is that compared to cleaning up that giant mess and then having to explain why you are such a dumbass?