Here is the drop leg jack you will want to use, and this is why. No need to get down in the mud to release this pin, raise or lower this drop leg. It's easier and safer. You won't lose this one and it's easy to lubricate the gears.
Bronze bushing on crank shaft makes for easier turning.
Spring assisted lock pin for sure locking. Front pin provides easy access for left hand, right hand operation. Handle housing washer provides additional strength and alignment. Heavy wall legs for heavier loads. 5 hole position on drop leg has more choices and maximum strength.