The 1Up rack isn't perfect but stability/security of the bikes in the rack is not a problem. When I look in the rear view mirror I see no significant movement, whether it's our mtb's with 29x2.3 tires at 20 psi or our road bikes with 700x23 at 100 psi. Thousands of miles of pavement, hundreds of miles of dirt ... they don't move enough to cause problems. That said, I'd still arrange them to keep an inch or two between bikes if you're carrying more than one (i.e. Seat on one, bars on another, etc) in case they move out of sync. Also, I got silver, cheaper and less likely to show scratches. Finally, I also got their locks, but if you have an appropriately sized U lock or even padlock to lock the rack to a tow chain eye on your hitch, you can both secure it against theft and accidental loosening with one device.
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Thread: 1up Quick Rack Quick Review.