Rampage Four is a Strangers and Freaks mission for Trevor.

Gold Completion

After an agitating conversation with some members of the U.S. military, Trevor gets really mad and goes on a rampage. Again. Just keep killing people.

This is probably the tougest of the rampage missions, so it's nice that you get the explosion inducing grenade launcher. This one is tough due to the flood of enemies and their higher caliber weaponry. And you know, there's a tank..

Tip: When the tank shows up, take cover! From your starting position look left for the curved wall. You can go back and forth on this to get some of the other approaching vehicles. But don't stick around too long, as the jeeps will occasionally try to flank you.