I would like to use a pair of hydraulic pistons to raise and lower a surface that will hold about 150 lbs, and be capable of remaining in either fully extended or fully contracted modes for long periods of time. Should I mount them so that
A: expansion pushes the surface upwards, causing gravity to act as a compressing force,
B: contraction pulls the surface upwards, causing gravity to act as a tensional force?
Why? Or am I worrying about nothing with such a small load?