stable but too steep

I have a rabbit with some lame hind legs and wanted him create the possibility alone to come out of the cage. Unfortunately, he will not accept it, even though I have the bridge even covered with carpeting. Simply too steep. Even the healthy rabbit jumping cross over it and do not go over the bridge. At the bridge itself one can say that it is done really stable and is also sew together easily. The manufacturer you can probably make no accusations, because in order to bridge a normal input of a commercial cage, you need well these Steep. Nevertheless, for me and my Hoppel's not usable.