Remember one thing.....there are people out there that get amazing shots on a tripod placed on grass and uncompacted soil out in paddocks.
......no need to over engineer it, you’re only placing fairly light loads on it in relative terms......a 140mm x 5mm pipe will hold tons of weight. You’re isssue is lateral movement and vibration. I think what you have, with gussets and filled with sand will be more than enough
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