Ooooh, I like my bikes too much to risk using something like that. My solution was (is) the "Port-A-Chopper" motorcycle transporter. Not a "welcome everyone" product name (I don't own any choppers) but it's a fine product. It is not cheap (what is that's of good quality?); however, it's a very well-made, excellent design that can be easily disassembled and stored in a relatively small space when not in use. I chose the single rail version.
It's made by QC Metal Fab, Inc., Elkhart, Indiana (Motorcycle Cargo Trailers : Motorcycle Transporter : Motorcycle Trailer for Sale : PortaChopper.com
) The only place I've ever seen it advertised is in the AMA Magazine. Saw the advert, called the company and after an informative conversation, ordered a single rail with the optional fenders, 12 inch tires, and spare wheel/tire. It arrived in several heavy boxes and took less than an hour to complete the initial assembly. After that it can be assembled and disassembled without tools.
I've transported motorcycles varying in size and weight from our BMW K75S, Versys 650, and Suzuki TU250X behind our Jetta Sportwagen diesel with perfect confidence. I've almost forgotten it's there. It tracks straight as an arrow, has compliant torsion suspension, is easy to load and off load, and is built to last.
It has a lot going for it actually. It's less expensive than other quality bike transporters, doesn't take up anywhere as much storage space, isn't as heavy, and doesn't cause me to wonder whether my bike will suddenly decide to part company from the "stick-it-in-the-hitch-receiver-with-front-wheel-only-off-the-ground carrier. Oh yeah, and when I offload the bike both the front and rear tires will have the same number of miles on them.