a same pair could be extending from one another as to form a single wire cable that would ensure a same tension on both sides of the respective wheeled panel 94 connected thereto the train panel structure 90 is adapted to be rollably displaced away form the two roof sections 40 into a storage channel as illustrated in fig2 to free up the two roof sections 40 and allowing them to be displaced into their retracted position here again different type of driving mechanisms not shown could be considered such as another weight piston cylinder assembly or the like depending on the needs alternatively the intermediate support structure 90 could be a more simple closing and releasably securing mechanism located between the two roof sections and mounted thereon not shown in the present case as better seen in fig2 6 10 and 13 since each pier 42 orientation is angled relative to the translation displacement direction 100 of the corresponding roof section 40 between the deployed and retracted positions the angled displacement direction of each support bracket 44 forces the attachment point 102 of the respective support bracket 44 to the roof section 40 to translate relative to the center of gravity 41 of the roof section 40 perpendicularly to the translation displacement 100 of the roof section 40 accordingly to ensure.