I am going to buy a Fiamma Caravanstore Sun Canopy.I have read all the previous comments here re them. I have an Elddis Odyssey 524 where the awning rail 'curves' slightly downwards towards the front of the 'van. I would like to order the 360cms sun canopy but this would include using about 40cms of the slight 'curve' to the front. This would make about 1" difference in level from the awning rail at the back of the canopy to that at the front. Can anyone tell me if this would make any difference to the fitting and use of the canopy. In other words, must the whole length of the bag be on the straight part of the awning rail?