Ah, monster trucks: that started out as an advertising gimick for a 4x4 parts and accessories shop.
It looks cool, it might give greater clearance under the vehicle.... it also makes it liable to tipping over more easily, poor handling in corners, and subject to mechanical issues you'd not experience otherwise. While I can 'justify' a 3-4" lift in some trucks and SUV's, in most cases it's about being cool and liking the look: it sure doesn't drive very well.