1600lbs isn't a lot of stuff. sounds typical to me. things add up fast. anyone that figures 3-500lbs for "stuff" doesn't really know what things add up to. My trailer is 7100lbs empty, loaded for a trip it weighs 9200lbs. this is why I say to add at least 1500lbs to the dry weight. this will get you close to your ready to travel weight. its also why you need to look at CCC. some trailers only have 1200lbs, some (like mine) have a 4100lb CCC. 7100lbs dry and 11,200 GVWR.
And they shipped mine with "D" rated china bombs. they lasted about 500 miles before a tire shifted a belt. I installed "E" rated Carlisle`s that carry much more weight. haven't had an issue since.