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I agree that for a tripod, being adjustable easily, a well made slab would be fine. Particularly if there is no moving load on or near the slab while in use. Bribie should be flat and sandy but there may be a lot of filled ground.
A good slab requires a minimum of 100mm of well reinforced concrete on a bed from which all organic topsoil has been removed and replaced with at least a minus 7 crushed aggregate base, preferably wet and packed smooth.
A pier however requires, well , a pier into the ground as deep as you are prepared to drill to avoid seasonal and long term movement of the upper soil . Preferably three or more drilled concrete piers and a pier cap or slab if the soil is sloping and reactive to limit rotation ( or the ability to adjust.) There are also cheap steel and screw piles which could work in soft or sandy soil.
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