I just weighted my camper trailer. Dry weight for rego was 360Kg as a box trailer only with spare wheel, alloy tool box over ride brakes and a empty water tank.
Completed trailer with a Rooftop tent, pull out awning, solar panel. tailgate kitchen, porta potty and cooking gear no food total weight 502Kg with a ball weight of 66Kg included in the 502Kg Trailer size overall 3.74m long 1.65m wide, trailer box is 1.52m x 1.07m (5x3'6) I built it as a small trailer to be pulled by my Suzuki Jimny.