Toyota FJ Cruiser Trailer Wiring | etrailer Trailer Wiring Harness Installation - 2008 Toyota FJ Cruiser. Today on our 2008 Toyota FJ Cruiser we'll be installing the Tow Ready T-One vehicle wiring harness with 4-pole flat trailer connector, part number 118405. To begin with we'll go ahead and open up the rear hatch on the FJ Cruiser. Amazon: fj cruiser trailer wiring harness Amazon's Choice for fj cruiser trailer wiring harness. TOYOTA Genuine Accessories 08921-35870 Hitch Converter Kit. 4.6 out of 5 stars 73. $96 $ 96. 20. Get it as soon as Mon, Jul 29. FREE Shipping by Amazon. More Buying Choices $86 (12 new offers) Oem Toyota Fj Cruiser Hitch and Harness Kit.