Question of short-term overrun of trailer load D4 FWD

Hello and good evening, I would like to help a friend who has a defective Ford Mondeo 180 km away from our home town, who needs to be picked up for repair. The vehicle weighs empty 1250 kg, the trailer weighs 700 kg. This means that the trailer load would be exceeded on the way back 150 kg, since the XC 60 only 1800 kg braked trailer load are allowed. The distance is relatively flat (Hannover to Soest) The dice have not fallen yet, if I help there kan n, apart from the fine (30€), what technical problems do you see there? Also via PM. PLEASE not a moral discussion! Thank you for your help