Collection: 2015-2019 GMC Sierra 3500HD Bed Extenders

Bed extenders for the 2015-2019 GMC Sierra 3500HD, fitment confirmed for 6.6ft and 8ft beds. Stocking AMP Research BedXTender HD Sport and Max, plus Dee Zee steel extenders, with variants for factory spray-in liners and tie-down loops.

Will a bed extender work with my fifth-wheel or gooseneck hitch? Yes. AMP Research models fold flat or flip into the bed to clear gooseneck balls and fifth-wheel kingpins, so you keep towing capability without removing the extender.

Verified fitment for your Sierra 3500HD, no guesswork.