I am looking for a platform bike rack. I am considering the Kuat sherpa 2.0. Because of the model of my car I need to purchase the 1.25" hitch. The point in getting a platform rack is that I ride a heavy electric bike--around 50 pounds with battery. The battery is heavy, and easy to remove, but I do need to know the weight capacity for each bike? Also, what is overall maximum weight for a 1.25" hitch?