Turtle class Hover Mobile Artillery Tank.
Sort of idea I had for one of the factions in my comic, this comes basically to the machine side... A sort of tank that can deploy itself and turn into long-range artillery but still capable to defend itself from minor threats.
Moderately armoured, main weapon and other protected mostly by the armor plates that have folder over/around them. Rather slow movement, so it has two turrets protecting it from the sides.
Deploys itself onto the ground, the armor partially digging into the earth to give it some support. Main weapon, triple-barreled railcannon, deploys and gives it long range bombardment ability, along with rapid fire capability due three barrels. Has somewhat less armor in this mode. Turrets still function, giving it defense against infantry and light vehicles.