Being that I am involved with the old car hobby, I am familiar with what you are referring to. The process of chrome plating plastic is done by putting a thin layer of aluminum onto the plastic and then covering that layer with a lacquer finish. It isn't very durable to say the least. It is done on many cars and trucks, and if you look at a '97 Ford Explorer, you will note that where the hood opening is over the grille, that the grille is tarnished. This is a result of the acid rain dripping down over the "chrome" and washing away the protective coatings. The same will happen to your truck. The process is very expensive to have done on a per piece job and I wouldn't recommend that you pursue this any further. If you want to go further, look in Hemming for a company called Mr Mustang Plastics (or it might be Mr. G a sign of my old age), or something like that. They do this type of restoration service. Very expensive, but they are the only ones that I know of. A piece about a hard ball size is about $45 for an example. That is a air conditioning duct ball end for a 1967 GM car. That figure is for plating only!!!!!