Recommended Trailer Hitch And Wiring For A 2020 GMC Terrain

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Question:

Im looking for a tow package for a 2020 GMC Terrain Class 3. Vehicle has never had anything installed before, might need extension wire harness connecting to vehicle

asked by: Erica

0

Expert Reply:

Hi Erica,

For your 2020 GMC Terrain I recommend going with the etrailer Trailer Hitch Receiver # e59ZR for the trailer hitch as long as this isn't a diesel model. If you have a diesel model you'll need the Draw-Tite Max-Frame Trailer Hitch Receiver # 76217 instead. The # e59ZR is a simple bolt-on design and comes with a 2" receiver tube opening to mount your accessories in.

For the wire harness you'll need the T-One Vehicle Wiring Harness for Factory Tow Package # TK67KR if this model came with the factory towing harness. If you check out Brad's installation video below you can see if you have the factory connector for this to plug into.

If you don't have the factory tow package you'll need to go with the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118764 instead. This comes with connectors that will simply plug into your factory tail light wiring for a fast and easy installation.

For the ball mount you'll really want to measure the height of the hitch and coupler on the trailer to see if you need a rise or drop to tow the trailer level. I've attached a link to our help article on measuring for your rise/drop to help walk you through the process. Let me know what you measure and the coupler ball size and I'd be happy to recommend some options to fit your needs.

expert reply by: Kevin C

0

Heather A.

11/17/2025

Hey Erica, how did things go with the hitch and wiring setup on your GMC Terrain? Were you able to confirm whether your vehicle had the factory tow package before choosing the harness? Your update could make it easier for the next person working on the same setup.

Answer 1

In order to determine if a 2020 GMC Terrain has the factory tow package you will need to take a look in the rear fuse box on the driver side of the vehicle. In the fuse box there will be two locations you need to check, K2 and K3 which are for the…

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Answer 2

We do have a trailer wiring harness for a 2020 GMC Terrain without the factory tow package, which is a universal splice-in kit. For that you'd need the Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector #C59236.

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Answer 3

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 4

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 5

The main difference between the Curt Trailer Hitch Receiver part #C13416 and the EcoHitch Hidden Trailer Hitch Receiver part #EH97FR is that the EcoHitch has a completely hidden cross tube whereas the Curt cross tube will be visible from the rear of…

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Answer 6

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 7

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 8

Yes, it will work. You'll just need to cut the Lance 6-pin connector out and rewire it into the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector item #e99011. Here are the individual functions of that Lance 6-pin:…

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Answer 9

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 10

Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and…

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Answer 11

Hey Ricardo! Yes, the Curt Trailer Hitch Receiver #C82RJ is the hitch Curt is working on for the new 2027 Telluride. This is a pre-order since Curt hasn't finished the design. It does not include wiring. The wiring harness for the 2027 is also up…

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Answer 12

Hi David! There are quite a few hitches offered for your 2026 Honda Odyssey, so I definitely understand wanting to know the differences. There are basically three styles available for you and I have them broken out below: Exposed Crosstube: etrailer…

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Recommended Trailer Hitch And Wiring For A 2020 GMC Terrain

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