I assume the point of his post was to not trust the states dry weight. I don't know why everyone is so concerned with the added gear the OP loaded into his trailer. Maybe his wife is like mine, we have a 5 yo and a 3 month old and we basically take our entire house when we camp for 9-12 days. By the time I load up firewood, bikes, ice chests, pack and plays and whatever else I need I'm sure I add considerable weight.....maybe not 1600.
I agree on the tire swapping though, my trailer weights 10,350 fully loaded ready to camp with roughly 9100 on the axles. It came with d rated tires that support 10,240 on the axles. When I replace them I'm going with E rated tires for a little extra weigh carrying capacity.