Help with conduit strength

The attachment comes from Jake's garden.This trelis is so neat!I'd like to build a 20+ feet by 10 feet trellis using 3/4" or 1" EMT for 2 passion fruit trees in backyard. I have 2 questions:1: 3/4" emt vs 1" emt, which one is better? is 3/4" strong enough? 2: what's the maximum spacing between the pillars that is grounded contact vertically? Thanks

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