Yes, bike rack # TH910 would be a great fit for your 1998 Infiniti I30 Sedan. You would use a setting of 6 on the Thule Fit Dial featured on the rack. view full answer...
For your 1999 Infiniti I-30, the item you selected, Thule Passage 2 Bike Trunk Bike Rack, part # TH910XT, will fit your vehicle.
If you wanted to carry 3 bikes you could use the 3 bike version of this rack, the Thule Passage 3 Bike Trunk Bike Rack, part # TH911XT.
You will want to use the 6 setting on the fit dial when you are installing the Thule Passage on your vehicle.
If you will be carrying womens, childrens, or alternative frame bicycles, I would recommend using the Thule Bike... view full answer...
For your 2000 Infiniti I30 I recommend Tekonsha trailer wiring harness # 119178KIT. It is one of the more simple options and gets all of its power through the tail light wiring on the vehicle meaning it does not require a connection to the vehicle battery. I have included a link to a video showing an example installation on an I30 for you. view full answer...