The trunk rack is not as secure and can scratch. I've found a hitch for the G35, but you have to cut the rear bumper cover to install. See the attached link.
http://www.hitchesonline.net/i...5.htmI've got a trunk mounted rack and a trailer hitch mounted Yakima rack. I prefere the hitch because it can not damage the trunk lid.
I ride a '02 Specialized S-works FSR Mt. Bike and a '01 Bianchi SL Lite Alloy frame w/ Campy Daytona 10sp Road Bike.