Okay I am thinking about buying an old 1979 dually crew cab for real cheap. I didnt have time today to really look it over... Heres my question. I assumed it was a 1 ton but the badges on the fenders say its a c20 and I also noticed that it didn't have hydroboost, which I assumed it would if it was really a one ton. So did GM ever make a 3/4 ton crew cab dually or did someone just put fenders off a 3/4 ton truck on this thing? Also the back of the cab has emblems that say 3+3 camper special. Whats that stand for exactly? Extra overload springs? Im thinking theres no way but Iv also seen some weird things so who knows.