in the RV industry, almost all brochure/website "dry" weights are a base trailer.
none of the "options" weights are included in that number.
my Roo has a "dry" weight of 4071lbs.
sitting on the dealer's lot, from the factory, it weighed 4471lbs.
that was with the basic "options" that most trailers have, such as: awning, oven, a/c, spare tire, microwave and so on.
and that was before battery and propane.
i've found that you can easily figure at least 400lbs. for the weight of the usual options.
as was said, the factory sticker weight is the only thing to actually give you a realistic number, unless you take it to the scales.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC