40 lbs each is much more plausible to me. I took notes of the phone conversation, but did not note whether it was a single side or the pair. Seeing that most are 3/16" steel, 80lbs is more reasonable.The Billy rockers from Nemisis look interesting, but the rub rails aren't removable. Not that scrapes and dents are likely. Well, I could drop off on a stump. That's about the perfect height and size to destroy the rocker area.
I like the looks of the C&C Fab, and rocker guards of that style. I wonder if that's to much leverage on the body panels though. Maybe they are 40 pounds, each? That's almost plausible.
Motobilt also has a rock slider for our TJ's. I just mention them because I think they are a good company with some interesting products.
I'm not sure if you want a step or not to aid in ingress and egress. Not having a step saves weight, of course.