This was one of those projects I probably should have finished the day before, but after spending hours cleaning oil, dirt, and degreaser out of my driveway, motivation was running pretty low. Fortunately, the trailer wiring installation turned out to be one of the easier upgrades on the truck.

The process was mostly a matter of removing interior panels, routing the wiring, plugging in the harness, and securing everything so it looked like it belonged there from the factory. The kit itself was completely plug-and-play, which is always appreciated. The biggest decision ended up being where to mount the trailer connector. I spent more time than I'd like to admit crawling around under the rear bumper trying different locations before realizing Toyota had essentially already solved the problem. After comparing a few mounting options, I found what appeared to be the factory mounting location and installed it there.

Routing the wiring into the cabin took a little more effort. Thankfully I found a video showing a clean routing path, which saved me from unnecessarily disassembling half the truck. Once everything was pulled through, I secured the wiring and cleaned up the installation so there weren't any loose wires waiting to rattle around later. The converter box presented another small decision.

The instructions called for mounting it with self-tapping screws, but I wasn't particularly excited about drilling new holes into perfectly good sheet metal. Instead, I used adhesive to secure the module directly to the body panel. No new holes. No exposed hardware. No regrets.

Once everything was buttoned back up, the installation looked clean, functioned properly, and gave the 4Runner one more piece of functionality that I knew I'd eventually need.

Not the most exciting modification I've done, but one of those practical upgrades that's nice to have long before you actually need it.