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Adding Rhino-Rack Legs and Crossbars to a Track System on a 2021 GMC Sierra AT4


I have a 2021 GMC Sierra AT4 with 58 bed and Retrax RX Pro cover. Id like to add the Rhino-Rack RLT600 leg set. Cant decide between the HD square tubes or the vortex. The slots on the rail are 64 across. What length cross bar should I be using? Thanks!


Expert Reply:

It sounds like you already have tracks on your 2021 GMC Sierra AT4 and are looking to add legs and crossbars to complete your roof rack.

The Rhino-Rack RLT600 Quick Mount Legs, part # RRRLT600, are designed for Vortex aero bars, which is what I will recommend since aero bars cut back on wind noise and drag and tend to have better versatility with regards to accessories.

If you end up wanting the Heavy-Duty square bars, let me know and I will find the proper feet and crossbars for those.

In the meantime, for your Quick Mount legs, the Vortex bars are the ones to go with. As for the length, it looks like the 64 inches between your tracks would make a nice mount for bars that are 71" across, giving you a little room on each end in case you need it.

The part number for 2 of the 71" Vortex bars is # RRVA180B-2. They have a capacity of 165 pounds, but the legs have a capacity of 110 pounds, so that will be your limit. I've linked to a video review of these bars along with the legs for you to look at.

expert reply by:
Kef G

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