When installing a trailer wiring harness on your 2021 Subaru WRX The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56259 is confirmed to fit your vehicle. This 4 flat harness will connect to your rear tail light, and everything will work correctly.
The wiring has a plug and play installation that plugs into the vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will also have to run the hot lead up... view full answer...
I would be happy to help you put together the components you need to build your own trailer and do my best to keep the weight down. You are off to a good start with the Timbren Axle-Less Trailer Suspension System - Spindle w/Brake Flange item # ASR1200S04. These weigh around 50 lbs. However, the brakes you linked item # 23-48 are for 7" hubs and we do not have any that will fit the Timbren systems so you will need to go up to 10" hubs and drums.
I recommend the Dexter Trailer Hub and... view full answer...
I spoke with my contact at Yakima who said that the adapter sleeve that comes with part # Y8890203 that you referenced is not available by itself. You will need a replacement tongue.
For that the recommended option is the Replacement Shank # Y8880041 along with the hardware to secure it to your hitch receiver # Y8780022. view full answer...
The Blue Ox # BX3620 is indeed the correct base plate kit for your 2018 Subaru WRX.
In addition to the base plates, you'll need a tow bar like the non-binding Blue Ox Ascent, part # BX4370. A non binding tow bar allows you to attach and unhook your vehicle easily even when on uneven terrain and when the vehicle isn't perfectly aligned behind the motorhome. Safety cables are included.
You'll also need a wiring solution like the Roadmaster Diode System, part # RM-15267 and a supplemental... view full answer...
As long as your 2018 Subaru WRX has the center knockout panel in the rear bumper for a trailer hitch we do have a 2 inch receiver that fits; the EcoHitch, part # 306-X7257. I've attached a picture so you can see where it fits through the bumper. I've also linked the install details for you.
If you don't have the knockout panel then the only hitches available for you are 1-1/4 inch receivers. In this case your best option may be to replace your rack with a trunk mount. The Yakima FullBack,... view full answer...