2017-2019 GM 2500HD/3500HD 6.6L L5P Duramax Tonneau Accessories

Adding on a premium tonneau cover to your 2017-2019 GM Sierra or Silverado is a great way to improve the functionality of your ride, but even the best bed covers can benefit from a few accessories. At Alligator Performance, we offer a range of tonneau cover accessories and add-ons to help you maximize your truck’s overall utility. Whether you're looking for better organization on the job site or need extra storage capacity for long road trips, these accessories ensure you get the most out of your GM 2500HD/3500HD truck.  GM Duramax Fitments: 2017, 2018, 2019 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.