Sounds interesting Steve, I wood ave never thought of this ?
But I suggest going with a 150 x 150mm hardwood square or round post 150 diameter would be pretty solid, providing it is packed in properly, I mean, if a meter in the ground, fill in only the 1st 6inches and go hard with the back end of a crowbar or similar, & keep packing 6" of fill at a time ?
As for the top plate to secure the mount, Id probably use steel directly under the mount, as the securing Bolt for the mount wood need a solid anchoring medium !
but the plate directly on the post could be made of wood I reckon, just my initial thoughts ?
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