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Trunx Rooftop Cargo Box - 18 cu ft - Black

Trunx Rooftop Cargo Box - 18 cu ft - Black

Item # TRX34FR
Our Price: $428.98
Roof Box
This item qualifies for Free Truck Freight Shipping
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
  • Factory Bars
  • Round Bars
  • Square Bars
  • Short Length
  • Large Capacity
  • Trunx
  • High Profile
  • Black
  • Passenger Side Access

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.


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.


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.


by: 07/15/2021


See what our Experts say about this Trunx Roof Box

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