* Check the sticker on the driver's side doorjamb: This sticker will list the GVWR, along with other important weight information.
* Consult the owner's manual: The owner's manual will also specify the GVWR for that specific vehicle.
* Use a VIN decoder: Entering the vehicle's VIN (Vehicle Identification Number) into a reliable VIN decoder website or service can provide this information.
Without knowing the specific trim level and options of the 2015 Chevrolet Suburban, I cannot give you a precise GVWR.