I can't seem to find the thread with the company building the stealth/low-profile tow hitch for bikes. I wanted to contact them about something similar but I can't find the thread. They were in Seattle, right?
I got the link from TMC somewhere but am not sure if this is the company you were referring to but they support the Model S and are no drill ... Torklift Central - EcoHitch |Chevrolet Volt|Nissan Leaf|Mitsubishi I-Miev|Subaru Outback|Toyota Prius|Prius V|Prius C|Hitch|Seattle|Kent|Auburn|Puyallup|Tacoma|Renton|Covington|Sumner|Bellevue|Burien|Enumclaw|WA