What the others have said - forget dry weight.
Dry weight is exactly that: dry. No water, no propane. Or anything else. Just the bare trailer. It also excludes any installed options, even those that were ordered by the dealer and factory installed. Worse yet, it may be the weight of the base model of a series and not the more upscale variant you are looking at, even though the upscale variant has more features. Same goes for the hitch (pin) weight - it is the hitch weight that corresponds to that understated dry weight and nothing like what the weight will be when you are loaded for travel.