I don't know if you're out west, but when I had uprights I used a BVG hitch rack. It holds the bikes by the top tube. If you have a step through frame there is an adapter that runs from the stem to the seat post to mount the bike. With my Giant OCR C2 I just used the top tube and let the front wheel ride down a little. The rack has a release that lets it tilt down for getting in and out of your back door. The top clamp that holds the bikes on locks, and you can wrap a cable lock around the frames and hitch for more security. For a bike with an exposed cable on the top tube, I wrapped a washcloth around the frame and between the frame and the cable so the cable wouldn't be clamped against the frame. It has an arm sticking out down between the bike bottom brackets that you run a strap through the wheels of the bike to keep the bikes from swaying against each other. It comes in 2" or 1 1/4".
http://www.racknroad.com/bvgthule-xe...7.html#tdImage