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Trunx Rooftop Cargo Box - 18 cu ft - Black

Trunx Rooftop Cargo Box - 18 cu ft - Black

Item # TRX34FR
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Our Price: $556.55
Roof Box
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Shipping Weight: 37 lbs
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Roof Box TRX34FR - Passenger Side Access - Trunx
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In Use/Installed

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. Lowest Prices for the best roof box from Trunx. Trunx Rooftop Cargo Box - 18 cu ft - Black part number TRX34FR can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (1)
  • Q & A (6)
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Trunx Roof Box - TRX34FR

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




Ask the Experts about this Trunx Roof Box

  • Roof Rack for 2018 Buick Encore to Use Trunx Rooftop Cargo Box
    A roof rack does need to be purchased separately for your 2018 Buick Encore to install the Trunx Rooftop Cargo Box # TRX34FR. The roof rack used in the video is a Rhino-Rack and is truly the best option for a roof rack for your '18 Encore because it is the best value. The Rhino-Rack is the most budget-friendly roof rack that fits your Encore but is still a very high quality so I strongly recommend going this route. The rack will mount to the flush rails on your Buick and is made up of...
    view full answer...
  • Crossbar Spread Required for Trunx Rooftop Cargo Box
    I'm certainly sorry to hear about the cargo bag issue you had going through a snow storm. Cargo bags are really handy and easy to manage but weather can be an issue so you are smart to go with a cargo box. The Trunx Rooftop Cargo Box # TRX34FR you referenced uses U-bolts that will work on crossbar spreads from 22 inches to 31 inches and the spread of the SportRack Roof Rack # SR1010 on your Ford Fusion is going to be in that range so it is definitely going to work. The cargo box will...
    view full answer...
  • Recommended Cargo Box for 2019 Toyota RAV4 That Doesnt Obstruct Roof Antenna
    In order to use the Thule Motion XT # TH629706 on your 2019 Toyota RAV4 you're going to need 47-1/2" from the center of your front crossbar to the crease where the roof and the hatch meet. However, it's going to be substantially less than that when it comes to the antenna, so using a long box like this likely isn't going to be the best solution because you're likely going to see some reception issues if it's covered. I recommend considering the Trunx Rooftop Cargo Box # TRX34FR, since...
    view full answer...
  • 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 # SR7095 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...
    view full answer...
  • Replacement Mounting Hardware for Sears Sport SP-20SV Rooftop Cargo Box
    We have replacement mounting hardware for a Sears Sport SP-20SV cargo box, but the Replacement Mounting Hardware for Car Top Cargo Roof Cargo Box # CTC-18PARTS is only a fit for the Trunx Rooftop Cargo Box # TRX34FR. The correct mounting hardware for the SP-20SV is the Replacement Hardware Kit for Searsbox Cargo Box # TH05603. We don't carry that cargo box, and we would be unable to confirm any specific fits, but I believe it is a universal fit so there's no reason to think it won't...
    view full answer...
  • Durability Of SofTop Roof Top Cargo Carrier
    The Advantage SportsRack SofTop Rooftop Cargo Bag # HE3021 bag can be mounted and secured to the top of your horse trailer. That being said the bag is not waterproof per 0:40 of the video and water can get through the zipper potentially so these factors could cause the bag to not be ideal for all the time, permanent use. The bag may be more ideally used and then stowed away when not in use as it could wear down in the elements. An upgraded bag like the Rhino-Rack Rooftop Cargo Bag...
    view full answer...

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Info for this part was:

Test Fit:
Andrew K
Video Edited:
Jacob T
Video Edited:
Chris R
Edited by:
Daron K
Written by:
Brian T
Video by:
Aidan B

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