Well they do make rear sheet metal, fiberglass roll pans to replace rear bumpers. Weight savings usually cumulative thing. Your '88s bumper probably weighs more than mine, though if I were to pursue be as much from appearance than anything else. Some do look good.
Certainly wouldnt offset the super hitch addition, but you could unbolt bumper & related brackets-weigh it out. At least give you idea if its worth the effort as far as weight savings. Me I want the rear protection so even if I did a roll pan Id be putting on nerd, I mean nerf bars...
