This one has worked for me. Double gates that are chained in the middle move back and forth and encourage livestock to push on them. I dug a hole about 15" deep where the gates meet in the middle, inserted a piece of pipe level with the top of the ground and tamped the dirt. I then put an old T post, with the anchor up, in the pipe and chain the gates around it. The T post can be removed when wide equipment goes through.