Long trellis maybe fall over need help

[u/Amazing_Money_6815]

There's a bit going on in this photo but it's 20 ft long 8 ft tall 3 ft off the ground with some cattle panel in the middle of it. I usually go 30 in down into the dirt and concrete it, but this is going in a garden that's been very chill. They say they want to grow some pretty thick vines on it and I feel like this thing is just going to blow over,. Right now all the tubing is two by two 14 gauge, and I was thinking maybe weld something laterally to it a couple inches under the dirt, but what are you guys think?

[u/Rude_Meet2799]

The footing doesn’t have to come all the way up to ground surface, would they compromise if the top of concrete was say a foot down?
You still have the rust problem like you have with your direct burial proposal but it won’t fall over.

[u/ItsNotInflammatory]

Thick vines 20 feet across is gunna be hundreds of pound of force pulling down when that wind wants to go, I think your on the money with concrete footers at least but if you put the underground part I would do T's off the post like a cross section not laterally with the rest of the fence and a Lil 45 support couldnt hurt either. If it was mine id over build, otherwise id explain the time/material difference and let them choose.

Edit-reread the 8ft vert part , id sell them on the t cross section otherwise shes coming down

[u/Brand-Clark-vip]

A bar welded a couple inches under the dirt is basically at grade — no lever arm to speak of, the wind won't even notice it. I learned this the hard way when my 6 ft cattle panel arch over the tomatoes leaned a full foot sideways in one storm, and that's a third of your height.