I have an old Yak Getaway-4 that is based on Softride's parallelogram concept. (Yak no longer makes it, was it breaching Softride's patent?)

It works really nicely because you can lower the rack so you only have to lift bikes about 10 inches, even with a high-clearance 4 x 4 SUV, e.g. 4Runner. Easier for women or people with wrist injuries to load and unload their bikes.