What is the Length of the Hopkins Plug-In Trailer Connector Adapter - 4-Way Flat to 7-Blade?

Updated 04/24/2025 | Published 04/21/2025

Question:

2025 Toyota grand highlander. Need a 4 way flat to a 7way blade adapter without the need to use a separate secondary ground to the vehicle. How long are they.

asked by: John F

Expert Reply:

Hi John,

The Hopkins Plug-In Trailer Connector Adapter - 4-Way Flat to 7-Blade # HM54RV sounds like a great fit for your setup, especially since it doesn’t require a secondary ground.

Just a quick note: this is strictly an adapter. So, if you're towing a trailer with electric brakes, it won’t function with a brake controller, you’d need a different solution for that.

As for the dimensions:

- The length from where the 4-way harness starts (at the bottom) to the end of the 4-flat connector is 6 1/2".

- The 7-way connector itself is about 4 1/4", bringing the total length to approximately 10 3/4".

I went out to the warehouse and measured it myself, I’ve attached pictures for your reference.

Will that length work for your application?