I tried to use two of the store-bought concrete-posts as a ramp for my wheelbarrow and after a day's work both had developed cracks on the underside. So far my two landscaping timbers are holding up very well after three years of use. But my ultimate goal is to build a bee-house where the hives are quasi-inside and can be maintained independent from the weather, something similar like this:They are store-bought but yes, they are reinforced. There used to be 10 hives on them (on 3 blocks altogether) at one time so those are quite strong enough.
Which would also protect the entrances from wild weather and offers storage for the bee-utilities - and maybe the beekeeper…