Is tow hitch rated for weight distribution?

[KivaKarma]

I have a 2005 X3 that I bought used from a dealer in 2007. It did not come with a towing hitch, but I had them install one when I bought it. As it turns out, it is made by Oris, a German company. I am about to tow a travel trailer with the X3, and in an effort to be as safe as possible, I would like to use weight distribution bars with sway control. I have heard that in order to use these devices, you should make sure that your installed hitch is rated for weight distribution. The sticker on the Oris hitch, however, doesn't say that it is specifically rated for that. I'm hoping that it is plenty strong and that the only reason it doesn't have the rating is that it is from Germany. Does anyone know? I sure would appreciate any insight you have.