GVW or gross vehicle weight refers to the unloaded weight of the trailer. That means it doesn't include the weight of any 'accessories' like the batteries, propane tanks, awning, etc. It's not unusual for these numbers to be off significantly from what you would get if you took the trailer and had it weighed. A more important number is the GVWR or gross vehicle weight rating. This is the total weight that the trailer is rated to carry. It includes the trailer itself plus everything that is loaded on it and should never be exceeded. In this case it's 3150 lbs.
From the brochure the dry weight is equivalent to GVW and is 1680 lbs. The cargo capacity is 1470 so if you add them you get the GVWR of 3150 lbs.
Here's a link to a website that has pretty good descriptions of the terms and what they mean: