Roofing Quotes - To demonstrate the superior strength of DuraGrip adhesive, we challenged it to pull a truck, loaded with shingles, weighing 7,500 lbs. Is DuraGrip strong enough to survive this monumental challenge? Watch the video to find out. For more information on Advanced Shingle Technology or Roofers visit us online at: http://www.lionsroofing.com/products.htm?=AdvancedShingleTechnology