If you have a meter high deck your pier will need to be between 1.3- 1.8 meters depending on your goals.
I would recommend you get an 8" steel pipe with 12mm thick walls and 4 gussetts (3 inches wide) running up the sides in a cross shape for the pier. The base plate should be 15mm thick and a diameter of16". Just have a top plate welded on and you can then drill and tap any pier adapter in place.
This should give you a low deflection with a considerable load. It will also work for imaging too.
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