Today I have a 48 inch pedestal, the AP1200, and about 95 pounds of scopes (3). I am just beginning to see a bit of torque, as shown by the scope "bounce" when making an adjustment with the hand pad.
The only point I'm making to anyone in the design phase is to consider your original scope MIGHT not be there 3-5-10 years down the road. An Observatory means you WILL spend more time observing, which sometimes leads to bigger scopes.
This was the scope I designed for.
BTW, the pier is bolted to a "plug" of reinforced concrete measuring 18 inches in Diameter and 48 inches, into Caliche.