In-depth review
Thule Motion XT XL Review (2027)
In-depth review of the Thule Motion XT XL: mounting, dual-side loading, highway manners, and ownership costs.
Thule Motion XT XL
An 18-cubic-foot premium box with dual-side opening and SlideLock security.
Our verdict
The Motion XT XL justifies its flagship status in the small moments: clamps that click when torqued, a lid that opens from the side you are standing on, a lock that shows you it is locked. At highway speed it is as quiet as 18 cubic feet on a roof can be. The price is real and the storage problem is yours, but as an ownership experience it is the benchmark every other box is measured against.
What we like
- Dual-side opening means loading from whichever side the parking spot allows
- SlideLock system confirms the lid is closed and locked with a visible indicator
- PowerClick quick-mount clamps install in minutes with torque confirmation
- Aerodynamic shape keeps highway noise and fuel penalty at the class minimum
What to watch out for
- Premium price, several times a cargo bag
- Needs garage or storage space when off the car
- 75 lb load limit is shared with rivals, plan heavy gear accordingly
What owners report: Thule Motion XT XL
Synthesized from recurring themes in long-term owner feedback.
Most praised
- Opening from either side ends the parking spot shuffle at trailheads and services
- The lock indicator removes the motorway doubt about whether the lid truly latched
- Owners rate it the quiet benchmark, with wind noise barely changed at highway speed
Common complaints
- The purchase price is several times what a good cargo bag costs
- Off the car it demands garage corner or storage unit space all year
- Roof load limits still cap heavy packing despite the generous volume inside
Who it is for
Frequent road-trippers, ski families, and anyone who will mount and load a roof box dozens of times.
Mounting and loading
PowerClick clamps grip the crossbars from inside the box and click at the correct torque, turning installation into a five-minute, tool-free routine owners actually perform between trips. Dual-side opening sounds minor until a parking wall, a bike rack, or traffic dictates your loading side; then it is the feature. The SlideLock's separate locking and opening functions, with a visible locked indicator, prevent the classic drive-off-with-lid-ajar disaster.
On the highway
The Motion's shaping keeps wind noise to a background hush at legal speeds and the fuel penalty at the low end of the roof-box range. The box feels like part of the car rather than cargo on it, which over a ten-hour drive is worth more than specifications convey. Crosswind behavior is composed within the vehicle's roof load limits.
Ownership realities
The box weighs enough that solo mounting is a technique, not a lift, and it needs a home: garage wall mounts and ceiling hoists exist precisely for this product class. The 18 cu ft capacity and vehicle roof limits still cap dense cargo; this is a volume tool for bulky light gear, not a way to move bricks. Price it against years of trips, not one vacation.
Key specifications
- Capacity
- 18 cu ft
- Load limit
- 165 lb box rating; observe vehicle roof limit (typically 75 lb cargo class)
- External dimensions
- 84.7 x 36 x 17 in (approx.)
- Opening
- Dual side
- Mounting
- PowerClick quick-mount, fits most crossbars
Also consider
Yakima SkyBox 16 Carbonite
A 16-cubic-foot box with a dimpled Carbonite finish and dual-side access.
Why consider it: Equal flagship quality with a scratch-hiding Carbonite finish and slightly smaller footprint.
- Capacity: 16 cu ft
- Load limit: Up to 165 lb per Yakima rating; observe vehicle limits
Thule Pulse L
A 16-cubic-foot Thule box with FastGrip mounts and central locking at a step below the XT lines.
Why consider it: Most of the Thule ownership experience at a step down in price.
- Capacity: 16 cu ft
- Load limit: 110 lb (manufacturer rating); observe vehicle roof limit
Research-based assessment. TrueGear has not hands-on tested this product; this evaluation synthesizes manufacturer specifications, retailer documentation, and published expert reviews.
Questions, answered
Does the Motion XT XL fit my crossbars?
PowerClick clamps fit most factory and aftermarket crossbars within their size range. Check your bar spread against Thule's fit range and confirm hatch clearance before ordering.
How many suitcases fit?
Plan on four to five large soft duffels. Rigid suitcases pack poorly in the shaped nose and tail; soft luggage is the roof-box native format.
Can one person mount it?
Yes, with technique: lift one end onto the bars and walk it into place, or use a step stool. It is awkward rather than heavy; two people make it trivial.