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[SEAOC] Truss cambering

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     To those experienced:
     1. At what point costs of cambering vs costs of increasing member size 
     will offset one another. Do you think pound per pound, cambering of 
     long span trusses is more expensive that just adding muscle?
     2. is it sufficient to show camber amount at the top chord alone, or 
     should the values be shown for the bottom chord also, although it 
     seems they would be the same.
     3. Any idea on source of information on cambering of long span 
     I appreciate any responses.
     Thanks, Ghassem Khosrwonia