"DRY WEIGHTS" only exist for that moment in time when the TT rolls off the assembly line never to EVER return again. While manufacturers all play games with their posted weights most do not include the weight of batteries, propane cylinders, AC units, awnings {basically anything that could be considered an option}. Dry weights have absolutely nothing to do with the actual weight of your TT in normal use.
The only person on earth who enjoys using dry weights is the unscrupulous salesman who is trying to sell you more trailer than you can safely tow. Bottom line, NO ONE tows an empty trailer.
Good luck!
:C