Nice look for that truck. By the way if you're removing the OEM running boards to install rock sliders, just keep in mind you may get way more rock chips in your paint depending on the dimensions of your rock sliders. People in this forum have found out the hard way.
This thread was super useful, turns out heat gun 700F for a min (getting bolt up to 400+ measured with a temp gun) was the key to removing. Definitely heat them up before you even try to remove or you'll likely strip.