Volvo 850 Combi, trailer coupling too high for caravans

Hello together We have a Volvo 850 Combi with detachable trailer coupling (Original Volvo). If we now attach our trailer, it hangs very deep at the rear (in front of the trailer coupling too high, then very deep at the back). We now have big concerns about driving with this trailer on a ferry – the chance that the trailer is lying up and thus the ground is damaged is very high. Someone knows how to solve such a problem (put the trailer coupling somehow lower) or something ?) Thanks for advice Franziska