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Fiberglass caps are lightweight and sturdy with weights ranging from 80 to 120 lbs. Some companies provide pickup caps made of their patented material that is lightweight, as strong as fiberglass, and cost-effective. Aluminum caps are usually used in lightweight trucks. These caps are sometimes less expensive than their fiberglass counterparts, but can be dented easier than the fiberglass caps. (http://www.offroaders.com/tech/truck-caps.htm)H I am trying to find out how much the typical shell weighs but so far that information has eluded me.