Not sure why you're interested in dry weight. Most people load the RVs up and are much closer to the GVWR. Until you get the rig weighed as it travels, you should assume the pin will carry about 20% of GVWR. If it's close to the Oakmont weights, 20% would be around 3,100.
Also, dry weight specs (when the factory does get around to publishing) are often based on prototypes that don't have everything that ships with the unit. And never includes options ordered from the factory or installed locally. That's another reason to use GVWR as the starting point.