the Sledgehammer is just the Jackhammer's brother but suited for forest combat with that smooth sleek olive drab and its minigun perfect for clearing infrantry, vehicles and even trees if it needs to. the 4 AGMs can be used to destroy enemy tanks and seaborne vessels if they are close enough (target the USS Tiny). its 3 cannons and their loaders are enough to destroy anything it encounters though only one can move vertically the 2 other cannons are static. Sledgehammer's ability to be amphibious is perfect for swamps but it cant move through the water because SP's physics engine doesnt consider wheels to be moving in water even though in real life they absolutely can so try to use it on shallow swamps where the wheel can grasp the bottom and move.

AG 7: makes the 2 static cannons ready for use
AG 6: makes the anti-tree minigun ready for use
AG 5: makes the inferno AGMs ready for use