I think this is wrong. Rule 24.g.iv states "a diamond shape at or near the aftermost extremity of the last vessel or object being towed and if the length of the tow exceeds 200 meters an additional diamond shape where it can best be seen and located as far forward as is practicable"
Deck
Rules of the Road: BOTH INTERNATIONAL & INLAND What shape should a vessel being towed exhibit if th...
Discussing this exam question.
rule#24 (e)iii pg.52
When the length of the tow exceeds 200 meters, a diamond day shape is used. The logic here is during the day you don’t double the shapes because the length is more easily seen than at night , where you add to the lights when increasing length of tow