Update: I took a chance on the class II Curt hitch from etrailer. I had contacted Curt and they weren't able to tell me whether the hitch actually wouldn't fit the PHEV, or if they just hadn't confirmed it yet. Anyway, for the modest price of return postage it was worth a shot. Anyway, I can confirm that it will indeed NOT fit the PHEV. There is a little bit of frame reinforcement on the passenger side that keeps the hitch from fitting all the way onto the frame. Anyway, now we know and can wait for someone to make one for the PHEV.