Towing Covers

i have recently upgraded my caravan and now have one with a large middle front window. I am trying to get a towing cover that is long enough to cover the middle window. I've tried the usual suspects without success. One manufacturer tells me that they used to make them large enough but have shortened them to the height of the two outer front windows which leaves the top of middle window exposed to the elements. The reason they gave for reducing the size of the cover is that they had complaints from customers who said the wind was getting underneath the cover causing it to flap. I struggle with that argument as I tend to tow my caravan forwards which, I would have thought, would cause the wind to go over the top of the cover and not underneath it!  I am therefore looking for a cover of sufficient size. Any suggestions please.

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