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 - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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