For a great economical trunk rack that will not damage the trunk of your 2017 Genesis G80, I recommend the Hollywood Racks Express 3 Bike Carrier - Fixed Arms - Trunk Mount # HRE3. In order to protect your vehicle's finish, there are a total of 4 pads on the base that serve as support. In addition, the hooks that anchor to your vehicle include a rubber coating to add even more protection against damage.
If you want a suggestion for a rack that holds a different number of bikes, I would... view full answer...
The only trailer hitch available that is designed to fit your 2018 Genesis G80 is the Curt Class II Round Tube Receiver Hitch # C12165 that you mentioned. Trailer hitches will typically feature the same type of weight rating as the vehicle they are designed to fit. This is most likely why there isn't a higher rated, 2 inch option available for your vehicle.
This particular hitch features a 3,500 pound towing weight capacity and a 350 pound tongue weight limit. You will also want to verify... view full answer...