Go to
YAKIMA.
Look up the landing pads and control towers. I haven't seen anyone do this, but I know it will work with little modification. This is all lockable and also a quick release setup. It will take second to get this on and off. This way it will still fit in your garage. You would use your factory tracks or this. you won't have to add any height this way by using the factory crossbars.
I think that Thule make the factory one too.