Pierce has a plan to piss off someone, so get in the car and drive to the docks. When you get there, you see the Brotherhood so kill them all before going after the trucks, as it will make things easier. The simplest way of destroying the trucks without wasting a single bit of ammo is to use Telekinesis and toss them into the water.
Get back to the car after destroying all the trucks and start driving to the next destination (Zinyak messed up Biz Markie!). You’ll come to the Nuke Plant, where you’ll need to check the three crates for some nuclear waste while fighting off more Brotherhood. It turns out the three initial ones are empty, so Pierce suggests check out the other side of the building.
Kill more Brotherhood, check the crate for the goods and next up is you having to tail a guy. There will be a meter in the upper left, which should neither empty nor fill up, so keep following the car until you eventually come to the airport. It turns out that you’ve been going after Maero this whole time.
It’s best to ignore the small fry and go straight after Maero, who should be in a monster truck on the other side of the airport. He has a shield and might be staying inside of the truck, so use Blast to bring the shield down and shoot him. He’ll come out of the truck and this fight is like any other with a Warden. Once all of Maero’s health is gone, Pierce will get his powers and the mission will be over.