The self locking bit is just a taut line hitch, and you can do that on any midline loop by running the line through twice. I like the sheepshank version because it basically just shakes loose when you remove the tension/untie the knot. With the classic truckers hitch, that slip knot can jam. Id use, what I think is called, the slippery half hitch. Its like the slipknot but you add two extra twists before pulling the bite through for that midline loop. The alpine butterfly is also a popular option, but that can be hard to untie after heavy load too.