Actually, I went with a lightweight bumper mounted hitch. I'll be carrying under 100 pounds including mount, rack, and bikes. The hitch is a simple bolt-on mount but I'm a big fan of lock washers and "Lock-Tite". I have the opportunity to do some experimentation so I will - mount with some dead weight, mount with rack alone, and mount with bikes. I'll put up some results with photos in a week or so.