Oh man, 6x4 poles, no way, those are for shorter heights. No way they will handle 18 feet.
Laminated posts are much stronger than cut posts. Glue and nail 3 or 4 2x8 together to make a post. Then you don't need quite as long a wood, and the knots will be in different places. The bottom 6-10 feet are pressure treated so it soaks in the 2x pieces better, and the top doesn't need to be pressure treated to save money.
When you look at the trusses, ask about poles too - again, the factories that make these have gotten real good at doing volume work and pricing it pretty cheap, cheaper than you can buy the parts yourself.
Now all different if you have your own sawmill, or a relative and using home grown wood, and full size not the boughten 2x stuff that is only 1.5 inch.......
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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