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Base Rails for Thule TracRac SR Sliding Truck Bed Ladder Racks

Base Rails for Thule TracRac SR Sliding Truck Bed Ladder Racks

Item # TH21603
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Shipping Weight: 18 lbs
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Thule Ladder Racks - TH21603
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Customized base rails are specially designed to fit your vehicle. Required to mount your Thule TracRac SR truck rack, these base rails feature 2 separate tracks so that you can easily adjust the rack along the full length of your bed. Call 800-298-8924 to order Thule accessories and parts part number TH21603 or order online at etrailer.com. Free expert support on all Thule products. Guaranteed Lowest Price and Fastest Shipping for Base Rails for Thule TracRac SR Sliding Truck Bed Ladder Racks. Accessories and Parts reviews from real customers.
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  • Q & A (3)
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  • Used (1)
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Thule Accessories and Parts - TH21603

  • Ladder Racks
  • Ladder Rack Base Rails
  • Thule

Customized base rails are specially designed to fit your vehicle. Required to mount your Thule TracRac SR truck rack, these base rails feature 2 separate tracks so that you can easily adjust the rack along the full length of your bed.


  • Custom-fit base rails are required for installation of your Thule TracRac SR or Thule TracRac G2 sliding ladder rack (sold separately)
    • Rack mounts on and slides along 2 tracks
    • Rails run the length of your truck bed for maximum adjustability
  • Simple, stake-pocket mounting
    • No drilling required
    • Rubber expansion blocks, plastic shims, and necessary hardware included
  • Black anodized aluminum resists rust and stands up to abuse
  • Made in the USA
  • Limited lifetime warranty

Thule TracRac Base Rails

These unique base rails provide the foundation for Thule TracRac's customizable truck bed ladder rack system. No-drill, stake-pocket installation yields securely mounted rails that sit atop your factory side rails. Each rail has 2 tracks for maximum adjustability.

Thule TracRac Sliding Rack

Because the rack section at the front of your truck bed mounts to a different T-track than the one in the rear, the sections can be moved so that they are right next to each other. The result is unobstructed access to your truck bed and improved aerodynamics when you are not using the rack.

Thule TracRac offers accessories that are designed to mount in these tracks. Base rail tie-downs (sold separately) give you additional cargo-management options. These rustproof, aluminum tie-downs slide along the rails for optimal placement and are secured in place with the turn of a knob.

21603 Thule Track Rack Base Rails - Nissan Crew Cab Trucks

Replaces TracRac TA21603

Installation Details TH21603 Installation instructions


Ask the Experts about this Thule Accessories and Parts

  • Replacement Base Rails for Thule TracRac SR and Compatible Tonneau Cover for 2019 Ford F-350
    I have a solution for you, but the # TH21603 you referenced are designed to replace the base rails on a Nissan Crew Cab truck. Instead, you'll need to use the Base Rails for Thule TracRac SR # TH21000 in order to mount your old TracRac SR on your 2019 Ford F-350. For a tonneau cover, the only tonneau we have confirmed to be 100% compatible with the Thule TracRac SR is the BAK Revolver X2 # BAK39331. There are some other tonneaus that might work, but will potentially have some interference...
    view full answer...
  • Replacement Rubber Strips for Thule Trac Rac SR Ladder Rack Mounting Rails
    Thule offers the strips you speak of in a replacement hardware kit, part # 752-186-3001. They do not offer the strips as a separate item.
    view full answer...
  • 2020 Chevrolet Silverado 1500 TracRac Installation
    When installing your Thule TracRac SR Sliding Truck Bed Ladder Rack part # TH43002XT-782 onto your 2020 Silverado 1500 the front stake pockets are a little larger. In this case it is generally best to expand them by about 25 percent before putting them in to the pockets. This will prevent them spinning in the pocket preventing them from expanding out and getting a proper hold. If you still have issues after trying this please let me know so we can figure out what is going on. The attached...
    view full answer...

Do you have a question about this Accessories and Part?

Used Items Available

Condition: Surface Scratches

Notes: Kit has very minor cosmetic damage. There are some very light scratches on the bar assemblies otherwise it is like new and unused.

Our Price: $439.24
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Info for this part was:

Expert Research:
Mike L
Edited by:
Tyler C
Written by:
Matthew S
Updated by:
Hannah L

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