A simple way to reduce the labor of handling gravel,
firewood, rock or other heavy items in a pickup truck , is to remove the tailgate. This saves a whole lot of reaching over the gate, when the truck is loaded and unloaded and it saves having to dig loose material from the crack between the gate at the back of the truck.
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I was at the gravel mart yesterday, and when I remove the gate , a guy came up and marvelled at what he had just seen. Somehow this fellow had made it into his thirties without realizing how easy it is to remove a tailgate.
If I'm driving a short distance , on smooth roads, I don't replace it for the drive. Sometimes I leave it home. A makeshift gate can be made from a piece of lumber. This can be easily removed once a load of loose material reaches the destination.