English to French Tech/Engineering Ships, Sailing, Maritime accessoire de pont d'un bateau remorqueur

Il s'agit de ces 2 gros cylindres verticaux en acier sur le pont arrière d'un navire remorqueur entre lesquels passe le câble de remorquage d'un autre navire :

If deep water work is planned, weight on the stern roller can be hundreds of tons, which may be applied at a distance off centre line according to the set-up of the *** towing pins***. This shall add to listing moments and stern trim. This condition usually results in a reduction of stability and the deck edge is immersed earlier as the stern trim increases.

The calculation shall then be made to show the maximum force from the wire/chain, acting down at the stern roller and transversely to the outer *** pins***, which would be acceptable without taking the vessel beyond the angles stated above.