Without the cords, when you close most rooftop tents, the folds often lay to 'the outside and on the collective side of the closed tent'. This gives it a messy, bulky look on the sides and the cover is then often difficult to slide over. Dust can reach inside the tent sometimes because of an ill fit.
Take chalk and mark where each fold extends the furthest outside the closed tent, before you would normally tuck them in. These should be about the same on the opposite side of the closed tent. Sew in rings on the inside of the tent opposite each other and clip the bunjis when closing. You'll find that closing up the tent in the future goes quicker in the future too.
Thats the quick explanation.
