Hello Lee,
Can't say much about the suitability of the pier for your application but if you are going to bolt it to the footing you must use large gussets between the base plate and the pier. The main stresses are at the base joint. A lot of bolted on piers do not have adequate sized gussets. Having built a few piers out of different materials I would suggest that the base plate be a disc shape 340mm dia 12.5mm steel and the gussets 80mm at the base extending to a height of 320mm. The base plate being fixed to the footing with 8 x 12.5mm dyna bolts(or chem sets). 8 bolts ensure even forces round the base.
Common falacy is to fill the pier with sand - this is of very little use as the sand has no strength and will do little to damp the low frequency (mode 1) vibrations.
Jerry.
