I 'had' an Air-Cooled VW Typhoon Car Cover. Unfortunately after 3.5 winters it started to rip so now does not stay on the van. Seemed more like UV damage than stress on the seams. Until it ripped it was great, my van was always dry on the inside.
Very heavy weight, and I cannot fault its toughness, packs away quite small too.
Waterproof Vinyl Outer Layer
Ultra Soft Inner Lining
5 Year Warranty
http://www.mamotorworks.com/VW/product/bus-typhoon-car-cover_317933" onclick="window.open(this.href);return false;
Down side $199!
Might have to check out that 5 year warranty..
UPDATE:
Thanks to this post kicking me into action. Looks like my cover is still covered by the 5 year warranty.
Reply from the supplier.
"You are indeed still covered under the 5 year warranty. A replacement cover will be sent out immediately. We ask that you keep in mind that this new cover will only be covered under the original warranty which will expire in November".
Very pleased indeed.