GMC Sierra 2013 GMC Sierra 2013 For sale: MAX BOX storage box from Maxliner For Sierra or Silverado 2007 - 2013. Clean and in good condition, it fits inside the bed and provides secure storage space for items and tools. Available with a front lock Suitable for daily use and trips. Box dimensions Length at the top: 151 cm Length at the bottom: 117 cm Height: 58 cm