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http://i227.photobucket.com/albums/dd178/ftballguy8282/Statics2.jpg

I've simplified the distributed load on top of the bridge to: 2400 lbs above point A, 4000 lbs above point B, 3200 lbs above points C, D, and E, 4000 lbs above point F, and 2400 lbs above point G. The tip says to distribute the weight of the members at the nodes. I'm not sure what exactly that means. Also, I'm unsure of what I should use to start out with for the weight. I know obviously that the stronger the member the greater the weight, but I'm not sure how to start. Should I just use the 1" diameter pipe for each member and use that as a baraomter to go higher or lower? Once I figure out how to use the draw the weight, what would be the easiest way to find the external forces with so many known forces? Maybe moments about point G? Thanks for any help!