What GVW has your trailer ? I asked 950 kg trailer based on internet info (OM540 DL - 380 kg, engine, 200 - lets say 600 + trailer = 900.
But just in case went to car station to check boat + trailer weight and results was 1100 kg. Tank was 75%. I think that minimum for this boat is GVW 1200 (for trailer).
It looks like difference in weight between webpage and reality is about 150 kg
Petrol 70 kg
Engine 200 (internet info is 185 kg but wires, prop, ...)
So real result is about 530 kg versus 380 kg stated on webpage.
I think that they shows weight of empty boat without any console, seats, even Aframe.
Be aware if your trailer is limited by GVW of car or other limits/regulations