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What is the Largest Cargo Box I Can Mount on My 2018 Jeep Grand Cherokee?  

Question:

What Thule roof rack system will work with my vehicle?

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Expert Reply:

The largest Thule cargo box that will fit your 2018 Jeep Grand Cherokee is the Thule Motion XT Rooftop Cargo Box - 22 cu ft - Titan Glossy # TH629907.

If you want a Thule roof rack that is compatible with your 2018 Jeep Grand Cherokee that will be compatible with the Thule Motion XT, I recommend the following system:

- Thule WingBar Evo Crossbars - Aluminum - Silver - 53" Long - Qty 2 # TH711400
- Rapid Podium Feet for Thule Crossbars - Fixed Point - Qty 4 # TH460R
- Fit Kit for Thule Podium-Style Roof Rack Feet - 3142 # THKIT3142

expert reply by:
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Bob C

Jason S.

6/19/2021

What Thule roof rack system will work with my vehicle?

Bob C.

6/18/2021

From my research of your vehicle, there is a total available space of 66 inches from the furthest possible front point of your front crossbars to the line where the trunk and hatch meet on your 2018 Jeep Grand Cherokee. With that measurement, you will be able to fully open the rear hatch of your vehicle with a Yakima SkyBox 21 Rooftop Cargo Box - 21 cu ft # Y07337 mounted on top. 21 cubic inches is the largest Yakima box we carry here at etrailer. In order to transport the SkyBox 21, you will need a crossbar system on your flush rails. For a system that is compatible with the SkyBox 21, I recommend the following parts: - Yakima JetStream Crossbars - Aluminum - Black - 50" Long - Qty 2 # Y00425 - SkyLine Towers for Yakima Crossbars - Fixed Mounting Points, Flush Rails, and Track Systems - Qty 4 # Y53TR - Landing Pad 18 for Yakima SkyLine and Control Towers - Qty 4 # Y00244 - (optional for extra security) Yakima Same-Key Locks # Y07202 With the above roof rack system, you will be able to transport the Yakima SkyBox 21 on your 2018 Jeep Grand Cherokee.

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