Stop arm-chairing and second guessing and read the yellow label on the trailer. It is the actual weight of the rig as it leaves the factory. It's Federal law, not optional and if it's not accurate, they will be fined. The manufacturer will also specify what that weight includes, for example, Jayco includes applicable fluids and propane.
As far as the dealer updating the sticker weight for options added, why not ask a dealer. They would have no reason to not disclose that.
If you are looking at the numbers to determine the suitability of a particular tow vehicle, you will never go wrong with the gross vehicle weight. Anything at or below that number is good, unless you choose to load it beyond the factory specification. The weight of any dealer installed options, batteries, awnings, toppers, etc, all count against the gross weight, so regardless of what is aded aftermarket, that will still remain a good number and it's not going to change. If you want to argue over 10 lbs, you can probably find data at the local CAT scale to support your argument, and some people will do that simply for the sake of the argument
