GMC Sierra 2011 GMC Sierra MAX BOX storage box from Maxliner for sale For Sierra or Silverado 2007 - 2013. Not sure about other models, and its dimensions are mentioned for those who want to confirm. Clean and in excellent condition, it fits inside the truck bed and provides secure storage space for items and tools. Comes with four mounting bolts. Available with a front lock. Suitable for daily use and road trips. Box dimensions: Top length: 151 cm Bottom length: 117 cm Height: 58 cm