The advertised dry weight of a camper doesn't include any options for that camper; the first checkbox that is marked on the camper's order sheet increases the actual weight of the camper. On top of that, it is said that the average RVer loads 1,000 - 2,000 pounds of "stuff" into their camper - everything from pots and pans to grills to water in your tanks (fresh and gray/black) and water heater) to clothes to heavier mattresses to... well, you get the picture. You are going to know if you're in a smaller camper and pack lighter to a bigger camper and are of the "pack everything" mindset (which, to be honest is where we fall).
Some philosophies are to use the gross vehicle weight rating (GVWR) of the camper for your calculations from the specs. This is a decent idea as it protects you against a worst case scenario.