I bought a Prius hatchback and for one bike, I just put it in th e ack on a moving blanket. When my wife rides, I tried stacking hers atop mine, but I am just not comfortable with that setup. So, looking for rack that is lightweight so my wife or I can take it off and on as needed. I am only interested in platform style racks like the Kuat Sherpa (29 pounds) or maybe the 1 Up Quick rack (single 23 pounds double 41 pounds). Anyone have both racks or can compare them for ease of bike mount, locking, and stability when moving?