I'd consider at least the simple counterweight, that would remove a fair amount of the effort to raise and lower the bridge and give it some balance. If it was balanced at the half-way point, you'd have a lot less effort to raise and lower the bridge than without the weight. It's not only the effort to raise the bridge, but the strain imposed on mounting points for your lift mechanism. You may have plenty of power to raise and lower the bridge, but a mount might bust loose.
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