I'm going to be putting up a T-bar style trellis for some cold hardy kiwi vines I have coming in the mail. My quesiton is, what is the best way to anchor the end posts so that they do not sag inward with the eventual weight of the vine + kiwi crop? I'm not talking vertically anchoring the post in the ground, I'm talking a guy-wire type support extending downward at an angle from the top of the end posts. I've looked into either a metal stake with a tension wire vs. duckbill style in-ground implants that are inserted directly into the ground with the wire attached to them. Any experience or suggestions?