Leer┬« provides a full line of fiberglass canopies and tonneau covers.  They also produce a full line of commercial aluminum units.
   

Century┬« provides a full line of fiberglass canopies and tonneau covers. 
   

  
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ATC provides a full line of fiberglass canopies.
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If you are looking for light weight, versatility, and a reasonable price... the "RoyEl" Aluminum Canopy may be the right canopy for you