I've read a lot of threads about people removing or stretching their crash bars, but I haven't heard anything about people adding them to a 2015. Is it possible? I have a 2015 supercab and would be interested in adding them if it doesn't involve welding to the frame.

 

Crash bars? You mean bumpers? or Cattle guards (where most don't push cattle)

 

Since most folks have to cut them off to remove them, I would guess they are not something you can just bolt on.

 

No. The bars in front of the front tires but behind the bumper. They were only on crew cabs in 2015, but now they are standard on 2016 super cabs. They help in some front end collisions.