I have a 2012 Sportswagen with the panoramic sunroof which I absolutely love! My family and I are going on vac and have a cargo bag that can be strapped to the roof (used on previous car) however my concern is, can weight be put on top to of the glass? I know it has to be strong enough to hold snow, etc, yet I don't want to make a costly mistake. Does anyone been doing this and advise it or should it be avoided? I really appreciate any input. If this isn't the best option, I have read about diff crossbars, but haven't seen any top cargo boxes attached...any recommendations - brand, type etc would be great!