A 6.5′ Truck Bed for a 2011 GMC 3500HD is a popular terminology, but the 2011 GMC Sierra 3500HD has a short bed of approximately 6.6 feet. This is often rounded down to 6.5 feet in listings and accessories. Although this is a minor variance, it can affect the fit of accessories such as tonneau covers, bed liners and other aftermarket products. Be sure to check the precise bed size of your truck to ensure compatibility, fit and long-term use of aftermarket accessories.
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