I have used rear racks and the ones I haven't given away hang from the rafters in my garage.

I use a roof rack now. I believe it is more fuel efficient and far more versatile. My Saris system is unfortunately no longer available but I think Thule and Yakima have similar ways of loading bikes with both wheels attached as well as front wheel removed.

Besides bikes I'll carry Xmas trees, kayaks, furniture, cargo shells, ladders...