As Turbo said, dry weights are loose (at best).
The brochure weight does not include manufacturer options.
The yellow sticker dry weight does not include propane, batteries, water or any dealer options.
We haven't even gotten to your cargo, yet, and already your 5er may be well over the brochure "dry weight".
I'm guessing here, but I think when you refer to people stating on the forum "do not pay attention to the dry ship weight of a trailer", we are saying don't use that weight to decide how much you can pull. It has little to do with deciding if the trailer is too much for the truck.
You will see this occasionally. Someone will say "Can I pull this Humongous trailer that lists a dry weight of 9,000lbs? My vehicle has a tow capacity of 9,500lbs".
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD