Re: Car carrier for MBs - recommendations?
I use a Yakima brand rack that attaches to the trunk. Mine's an older model but comparable models are going for about $100-$140 on Yakima's web site. These racks attach at six points with straps and despite what you've heard, are pretty darn rock solid. I've carried two motorized bikes with mine, though that's probably pushing it a little.
If it's appearing unstable, it's not strapped on properly or is a cheaply made rack.