It should say the exact amount in the drivers side door jamb. If you have the owners manual it might be of help.
I can't say about the latest Chevys but in the past not all 3/4 ton trucks had the same rating. It depends on the spring rate, axles, tires, and breaks. I know some 3/4 tons have the same axles as a 1 ton where others are the same as a 1/2 ton. for example look at the number and size of the lug nuts. Some 3/4 have 5 where others have more and they are much larger.