First of all....Welcome to the site!
You have to know what your truck weighs. Go to the local gravel pit or find a Cat scale or hit a Flying J. Weigh the truck with a full load of fuel. Then get on the Chevy web site and look for the Gross Vehicle Weight of your truck. Subtract the weight of your truck from the GVW and will give you a "ballpark" figure for the size of your camper.
When you look at campers always add about 1000 pounds to the sticker on the camper. This will compensate for the food, clothes, camping gear,etc that will be added.
If the two (the truck and the camper) add up to the GVW , you are good to go.
If you are like most of us....you will find that you are overweight. Then you can add some suspension components, dual tires, Load Range E tires, sway bars, etc. This will help the truck deal with the load. It will NOT change the GVW of the truck.
Ford says I have a GVW of 11,200 pounds.
My truck scaled at 7850.
This leaves me a camper of weight of 3350.
Let's say my Lance 1130 is a bit more than that.