With a built-in RES™ rail expansion system, UltraGroove™  makes it easy to attach nearly any Thule® or Yakima® rack for bikes, kayaks, cargo baskets and more. With or without racks, it's incredibly easy to use and it's covered with a weather-resistant, padded ArmorTek deck laminated to rigid aluminum panels. It opens quickly with just a turn of the lock knob and closes just as easily with a pull on the built-in strap.

This Part Fits:

Year	Make	Model	Submodel
2015-2018	Chevrolet	Silverado 1500	LS
2014-2018	Chevrolet	Silverado 1500	LT
2014-2018	Chevrolet	Silverado 1500	WT
2015-2017	Chevrolet	Silverado 2500 HD	High Country
2015-2017	Chevrolet	Silverado 2500 HD	LT
2015-2017	Chevrolet	Silverado 2500 HD	LTZ
2015-2017	Chevrolet	Silverado 2500 HD	WT
2015-2017	Chevrolet	Silverado 3500 HD	High Country
2015-2017	Chevrolet	Silverado 3500 HD	LT
2015-2017	Chevrolet	Silverado 3500 HD	LTZ
2015-2017	Chevrolet	Silverado 3500 HD	WT
2014-2018	GMC	Sierra 1500	Base
2014-2018	GMC	Sierra 1500	SLE
2015-2017	GMC	Sierra 2500 HD	Base
2015-2017	GMC	Sierra 2500 HD	SLE
2015-2017	GMC	Sierra 2500 HD	SLT
2015-2017	GMC	Sierra 3500 HD	Base
2015-2017	GMC	Sierra 3500 HD	Denali
2015-2017	GMC	Sierra 3500 HD	SLE
2015-2017	GMC	Sierra 3500 HD	SLT