etrailer Hitch Rattling Against Exhaust on 2003 Honda Pilot

Which Hex Bolts are Needed to Attach Thule Hullavator to Crossbars of Malone Crossbars MPG217

Replacement Hitch Installation Hardware Kit for Hidden Hitch Class III Hitch 75599

Is Trailer Wiring Necessary or Difficult to Install on a 2003 Honda Pilot if Only Using a Bike Rack