Clean shot of a GMC Sierra tonneau cover bike rack system using Yakima Control Tower base rack with Yakima LP1 Landing Pads installed into Yakima 60" tracks. Bikes are held in place using Yakima Sprocket Rocket bike racks.

Nice job.  This GMC Sierra 1500 SLT 4 x 4 tonno cover bike rack system looks clean and mean.  Installed on the GMC Sierra tonneau cover is a set of Yakima 60″ tracks, which can be shortened to desired length with a good old hack saw.  Installed into the Yakima 60- inch tracks is the Yakima Control Tower Complete roof rack with two sets of Yakima Landing Pad 1 (LP1).  Carrying that nice Ibis road bike and that sweet Kona mountain bike are two Yakima Sprocket Rocket bike racks.  For security the Yakima SKS 6 pack of locks did the trick (4 locks for the Yakima Control Towers and 2 locks for the two Yakima Sprocket Rocket  bike racks).  Again, nice job. 

Installation page for complete Yakima bike rack/60″ track system details for GMC Sierra bike rack tonneau cover system.

Image depicts the Thule 688XT Atlantis 2100 cargo roof box used as a 2005 GMC Yukon Denali XL roof rack mount luggage-ski box.

When you need a cargo luggage box to carry everything, including the kitchen sink, you’ll be glad you found the Thule 688XT Atlantis 2100 roof box. The picture above features a 2005 GMC Yukon Denali XL roof rack luggage-ski box that is using the Thule 688XT Atlantis 2100 box to transport all the luggage gear and ski equipment for the entire family, including four boys! This is a premium cargo-ski box that includes locks, offers dual side opening for loading and unloading convenience, gorgeous  finish that will last for years and years and never fade or scratch (available in both silver and black color choices), opens and closes using one hand, installs on any cross bars including factory racks using the best-in-class universal adapter clamps etc.  Even features an aerodynamically engineered design to greatly minimize wind resistance and improve fuel efficiency. But hey, if you are driving a GMC Yukon XL Denali SUV, is gas mileage really your main concern?

2005 GMC Yukon Denali XL cargo roof box install details

Picture of a 2009 GMC Sierra extended cab roof rack using the Yakima Q Towers, Q118 Clips and 58 inch crossbars as the base system with a Yakima fairing attached to the front crossbar.

Thought your only option for a truck rack was a system for the pickup truckbed, check out this sweet customer installation of a 2009 GMC Sierra cab roof rack with wind fairing. The system is configured using the Yakima Q Tower roof rack system that includes a set of four Q Towers,  four Yakima Q118 clips and a pair of 58 inch length Yakima round cross bars. An extra-large 50 inch Yakima fairing is connected to the front crossbar.

2009 GMC Sierra pickup truck roof rack install details

gmc sierra truck rack using thule 375 Professional truck rack system with thule 883 glide and set kayak rack

Here is a good example of how a commercial truck rack can do light duty work on its days off from hauling up to 750 pounds of contracter supplies.  The Thule 883 Glide and Set kayak rack mounts directly to the crossbars of this Thule 375 Professional truck rack.  Shown also are a set of Thule 344 Load Stops which come free with the Thule 375.