NIMROD
There should be a sticker inside a cabinet or a tag rivited to the side (near the front), the front or the frame listing the dry weight and the GVWR at a minimum. Do not trust the posted dry weight too far, as this does not necessarily include all the options which are now installed.
And frankly, unloaded weight is of little value anyway. Aside from guestimating how much weight you can add, the GVWR of the trailer is a much more important value.