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Trunx Rooftop Cargo Box - 18 cu ft - Black

Trunx Rooftop Cargo Box - 18 cu ft - Black

Item # TRX34FR
Our Price: $422.10
Roof Box
Shipping Weight: 37 lbs
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56-1/2 x 38-3/4 x 19. Roof box mounts to your crossbars with U-bolts and hand knobs. Locking lid opens from the rear. Carries camping gear, sports equipment, and other cargo on larger CUVs and full-size SUVs. Durable, HDPE thermoplastic construction. Great Prices for the best roof box from Trunx. Trunx Rooftop Cargo Box - 18 cu ft - Black part number TRX34FR can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (7)
  • Q & A (0)
  • Photos

Trunx Roof Box - TRX34FR

  • Aero Bars
  • Elliptical Bars
  • Factory Bars
  • Round Bars
  • Square Bars
  • Large Capacity
  • Trunx
  • Short Length
  • Black
  • Passenger Side Access
  • High Profile

56-1/2 x 38-3/4 x 19. Roof box mounts to your crossbars with U-bolts and hand knobs. Locking lid opens from the rear. Carries camping gear, sports equipment, and other cargo on larger CUVs and full-size SUVs. Durable, HDPE thermoplastic construction.


  • Cargo box mounts on your vehicle's roof rack to provide enclosed storage for your gear
    • Perfect for carrying sports equipment, camping gear, or luggage for up to 4 people
    • Great for most full-size SUVs and larger CUVs
  • Rear-opening lid lets you load and unload gear from the passenger's side of your vehicle
    • 2 Metal struts hold the lid open
  • Built-in lock secures gear in box and secures box to crossbars
  • Latches on front, rear, and driver's side of box ensure lid is completely closed
    • Can be locked with padlocks (not included) for added security
  • Tool-free installation with included U-bolts, hand knobs, and plates
  • Aerodynamic shape helps minimize wind noise and drag
  • Compact storage - removable lid nests in base when not in use
  • Durable, HDPE thermoplastic construction
  • Matte black finish
  • Made in the USA


  • Application: most round, square, aero, elliptical, and factory crossbars
    • Maximum crossbar dimensions: 3-3/4" wide x 1-3/16" tall
  • Crossbar spread: 22"
    • Can be expanded to a maximum of 31" (requires drilling)
  • Carrying capacity: 18 cu ft
  • Weight capacity: 100 lbs
  • External dimensions: 56-1/2" long x 38-3/4" wide x 19" tall
  • Internal dimensions: 56-1/3" long x 38-1/3" wide x 18-1/3" tall
  • Box weight: 29 lbs
  • Limited lifetime warranty

Car Top Cargo logos

Mounting Diagram

TRX-18L Trunx Roof Cargo Carrier - Large - 18 cu ft - Black

Replaces Car Top Cargo CTC-18S

Customer Satisfaction Score:

Customer Reviews

Trunx Rooftop Cargo Box - 18 cu ft - Black - TRX34FR

Average Customer Rating:  3.0 out of 5 stars   (7 Customer Reviews)

56-1/2 x 38-3/4 x 19. Roof box mounts to your crossbars with U-bolts and hand knobs. Locking lid opens from the rear. Carries camping gear, sports equipment, and other cargo on larger CUVs and full-size SUVs. Durable, HDPE thermoplastic construction.


Save your money and do not buy this product, it's poorly manufactured to say the least. 1), the plastic gauge is way to thin making the final product to flimsy. 2) while the order information asked me for make, model and year of vehicle it did not match factory rail specifications. The factory roof rack system for Honda CRV is not adjustable and the 22 inch spread identified for product does not work for Honda installed roof rack systems. 3) lastly, the hinge design on this unit is poorly designed and will not align without modifications to bend the tabs so that they properly align with the slots.

Once again, do not waste your money on this product.

Etrailer Expert

Rachael H.


This rooftop cargo box can accomodate up to a 30 inch spread on some crossbars, but it would involve drilling to the custom measurements of your CR-V crossbar spread.


The roof top box is definitely big enough for my all my family's gear, planning a road trip out West that includes some camping along the way.

The plastic was a bit flimsier than I had expected and I was NOT impressed with the PLASTIC clamps around the side. I'm not too worried of the lid flying off if a clamp or two breaks - the front of the box locks and there is a pin in the rear hinge - however, I'm packing extra rope just in case. It also appears that the rivets holding the rails and lock to the container are also made of plastic.

I do a lot of camping, I'll likely update my review after putting it through a few runs.


I am not completely satisfied with this product, although it holds things ok. Made of plastic that is very flimsy/flexible. Would be better if it was rigid plastic. Also find the support holders are a bit difficult to put onto the little pegs (can't really see them do to being inside). Purchased for our make and model and still had some difficulty installing. Was not pleasant and I usually enjoy doing projects.


Put it together in just a few minutes. Very easy. Haven't actually mounted it to the car yet. In my case, I think side opening would be preferred as the Traverse is very tall and will require a small step ladder to reach the lock.


I have a 1 star because I am very disappointed in the quality . The plastic
Cover is badly warped out of the box making it very difficult to close. For the price of this product I am dissatisfied with the quality.


by: 07/15/2021


See what our Experts say about this Trunx Roof Box

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  • Will the Trunx Rooftop Cargo Box Fit for a 2017 Audi Q5 with 28 Inch Crossbar Spread
    The Trunx Rooftop Cargo Box - 18 cu ft - Black # TRX34FR comes setup for a 22" crossbar spread but can be expanded out to 31", so it will work for your 28" spread. You will need to drill new holes and the method that you've mentioned will work well to fit this to the crossbars on your 2017 Audi Q5.
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  • Will Trunx 18 cu ft Rooftop Cargo Box Fit OEM Roof Rack on 2016 Subaru Outback Wagon
    Yes, since the Trunx Rooftop Cargo Box # TRX34FR can fit up to a 31" crossbar spread (with drilling) you will be able to fit this box on your 2016 Subaru Outback Wagon. Crossbar spread is the distance from one point on a crossbar to the same point on the other crossbar so your spread is 30.25". Attached is a review video for you to check out.
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  • Rooftop Cargo Box to Replace Yakima Space Booster for Which Parts Are Not Available
    Thank you for the photo of your 1980's vintage Yakima Space Booster rooftop cargo box. I do understand and admire your interest in keeping that old box in use. I myself am "that guy" too. However, my contact at Yakima said they have not supported this box with replacement parts for quite a long time, due to its age. Available replacement parts for Yakima boxes can be seen on the linked page; most of these are for their newer products. Since your box requires lid supports that are no longer...
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    The spacing of the feet of cargo boxes will be narrower than the overall width of the cargo box. So basically what that means is you could use any cargo box so long as it has attachments that are compatible with the Rola crossbar dimensions and spread (spread being the center to center distance from one bar to the other). I believe the widest box we have is around 38-1/3 inches # TRX34FR.
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  • Will Trunx Cargo Box Fit a 2017 Toyota Highlander with 23 Inch Bar Spread?
    As long as your crossbars are less than 3-3/4" wide x 1-3/16" tall you would still be able to use Trunx # TRX34FR on your 2017 Toyota Highlander. However, this does require drilling new U-bolt holes in order to accommodate your 23 inches of bar spread.
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  • Can I Drill Holes into the Trunx # TRX34FR with a Crossbar Spread Longer than 31 Inches?
    I have a great rooftop box option for you, but we do not recommend drilling into the Trunx Cargo Box - 18 Cu Ft. # TRX34FR with a 32-1/2 bar spread. This is because the maximum allowed crossbar spread for the # TRX34FR with drilling is 31 inches apart. It is always strongly recommended not to exceed any limits put in place by the manufacturer because doing so can not only cause damage and void warrantees; it can also be dangerous. On top of that, we have not installed the # TRX34FR with...
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  • Two Large Roof Cargo Box Recommendations for a 2014 Toyota Sienna
    For your 2014 Toyota Sienna I recommend the Car Top cargo box # TRX34FR. This is an 18 cubic foot box that is far below your maximum budget. A comparable box in size from Thule or Yakima is at least twice as much so it is a good value. The Car Top box fits roof rack crossbars that are up to 3-3/4 inches wide and 1-3/16 inches tall. And fits a center to center bar spread of 22 inches as is but can be made to fit up to a 31 inch spread. It also has a no-tool assembly and installation. To...
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  • What Roof Cargo Box that Can Fit Crossbar Spread of 30-1/4 Inches
    Since there isn't a safe way to modify or adapt the Sportrack roof box you have to fit the wider crossbar spread you have the best solution we have would be a new cargo box that is compatible with that spread. The most similar solution we have would be the Trunx Rooftop Cargo Box - 18 cu ft - Black # TRX34FR which can have it's mounting holes redrilled to fit your crossbar spread of 30-1/4 inches. This box also has the same cubic footage as the SportRack SR7095.
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  • Roof Cargo Box that Can Fit 2021 Toyota Sienna with OEM Crossbars
    The Trunx roof top cargo box part # TRX34FR can fit the crossbars of your 2021 Toyota Sienna but you would need to drill new holes in the box unless your crossbars can be placed right at 22 inches. Basically any roof cargo box will fit your vehicle but if you wanted something a little nicer yet in same price range the Malone Profile18s part # MPG910 would be a really great option. It has a sleaker design, opens from the side, and has easier to use mounting hardware as well.
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  • Can I Drill Holes in the Trunx # TRX34FR to Accomodate a 38.5 Inch Bar Spread?
    I have cargo solution for you. While it may technically work to drill holes for the mounting hardware of the Trunx Cargo Carrier # TRX34FR, the manufacturer does not recommend drilling holes to accommodate a crossbar spread over 31 inches. Since we do not know the exact Yakima crossbars you have on your roof rack, the Trunx carrier will clamp around the bars as long as they do not exceed 3-3/4" wide x 1-3/16" tall. I recommend measuring the height and width of your crossbars to make sure...
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  • Will SportRack SkyLine XL Cargo Box Fit 2018 Chrysler Pacifica With Factory Crossbars
    We do have a cargo box that will work for your 2018 Chrysler Pacifica with the factory roof rack, but according to my research, the SportRack SkyLine XL Cargo Box will not fit. A cargo box at a similar price point which I can confirm will fit is the Trunx Rooftop Cargo Box # TRX34FR which will fit crossbar spreads from 22" to 31" but will require drilling new holes in the bottom of the box to get the U-bolts to mount to your Pacifia's crossbar spread. Like the SkyLine, the Trunx can handle...
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Info for this part was:

Employee Andrew K
Test Fit:
Andrew K
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T
Employee Aidan B
Video by:
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