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For very large piers leveling adjustment at the top can be useful. It does need to be very robust to not introduce a source of flexure under varying loads. This unfortunately can limit the amount of travel past the meridian before a flip is needed.
There is no correct answer.
This is my solution and it works for me. I never need to do a meridional flip as I can go more than two hours past the meridian. My western sky is more light polluted than my eastern sky. I can adjust the level by the eight bolts at the bottom of the pier.
Resonance is the major problem if you are not careful. The tapered gussets on my pier give the pier a low 'Q' for resonance.
Bert
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