Will The Thule Motion 3 Roof Box Fit On My 2025 Lexus RX350h?
Updated 08/07/2025 | Published 07/11/2025
Question:
I have a 2025 Lexus RX350h. I have decided on a new Thule Motion 3XL box and prefer to mount on Lexus OEM cross bars. How well does this work? Is there enough clearance under the bars for the Motion 3XL clamps to allow easy install and removal? Are adjustments needed to prevent interference with the RX350h and rear tail gait? I hate to spend the money on Thule bars to get more clearance if not needed but I dont want to buy the OEM bars if it turns out there are clearance or other issues. FYI - I realize the Thule bars provide options to mount more stuff but this is not important to me. I really only plan to mount the box on the bars and take it off once or twice a year. Think winter skiing and a summer vacation.
asked by: Ken
Expert Reply:
Hey Ken,
The Thule Motion 3 Roof Box, # TH87PN, mounts to most factory crossbars, along with the aftermarket options. However, you would need to measure and make sure the crossbar spread on the factory rack is enough to accommodate. Since it is a wide variety you should be good but the crossbar spread requirements for that roof box are 21-13/16" - 36-9/16" apart. Most roof racks will fit into that, but I recommend double checking. I am not entirely sure the dimensions of the OEM roof rack, but you really only need an inch or 2 of clearance for install and removal.
I believe the factory rack will work just fine for you. I would just recommend seeing if the Lexus dealership can get you an idea of where it will sit on the vehicle, and the dimensions.
Product Page this Question was Asked From
Thule Motion 3 Rooftop Cargo Box - 18 cu ft - Black Glossy
- Roof Box
- Aero Bars
- Factory Bars
- Round Bars
- Square Bars
- Extra Long Length
- High Profile
- Extra Large Capacity
- Dual Side Access
- Black
- Thule
more information >
Continue Researching
- Shop: Trailer Hitch
- Shop: Thule Motion 3 Rooftop Cargo Box - 18 cu ft - Black Glossy
- Video: Checking Out the Thule Motion 3 Rooftop Cargo Box
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Search Results: thule motion
- Search Results: price match
- Search Results: thule motion xl
- Shop: Trailer Wiring
- Shop: etrailer Anti-Rattle Hitch Collar for 2" Hitch Receivers
- Shop: Putco Element In-Channel Window Visors - Chrome - 4 Piece
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Shop: Redarc In-Vehicle BCDC Battery Charger - Dual Input - DC to DC - 12V/24V - 40 Amp
- Shop: T-Track Adapter for Thule Cargo Boxes with PowerClick
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Search Results: trailer hitch
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Video: Curt T-Connector Vehicle Wiring Harness Review C56040
- Video: The Low-Down on the Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Article: Trailer Wiring Diagrams
- Search Results: trailer wiring
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Video: Curt Powered Tail Light Converter Installation - 2023 Kia Telluride
- Shop: Suspension Enhancement
- Search Results: trailer tires and wheels
- Article: How to Choose the Right Trailer Hitch Class
- Article: How to Measure for Trailer Hitch Drop
- Shop: Brake Controller
- Video: Clean Up Your Trailer Wiring
- Q&A: Comparing the Curt Hitch C13416 and EcoHitch Hitch 306-X7396 for a 2019 Toyota RAV4
on Roof Box
Nick S.
8/7/2025
Hey Ken, How did it work out with the Thule Motion 3XL box on your Lexus OEM cross bars? Did you find the clearance was enough for easy installation and removal? I'm curious because it could really help others in a similar situation!