Why does the wing on the '08 Viper fall off so easily?

After driving many many cars through out Forza 6, if there is one thing that I can take away from it, it is this: The rear wing on the '08 Dodge Viper SRT-10 ACR is held on by thumbtacks. I am not even joking. If you so much as sneeze in the direction of a wall, the sneeze will bounce back towards the wing and knock it off. The wing on the '08 Viper is probably the most fragile piece of bodywork I have ever seen on a car in a game. And yet on cars like the Mercedes truck, you can flip the thing, hit the wing multiple times, and the sucker will stay on forever. What is the reason for the weakness of the wing on the '08 Viper?