Just bought this 2 owner 2004 zf6 6.0. Has a CB antenna mount in the center but also these 2 silicone dabs on the sides, my guess is some sort of emergency light bar like the ones used on chase trucks for big rigs hauling oversized loads. Just trying to find out if this truck was a hotshot truckers rig for the first owner. Really hoping it wasn’t. Also has holes in the bed from where a 5th wheel/gooseneck hitch used to be which makes me weary. Truck is very clean and seems to have been maintained very well.