The Zaxis is rated at 30 Amps. If you go with dual motors you will be max draw at least 40 and up to 60 Amps current. The Relays in the Zaxis would fail first. I though about going dual motors but knew I would have to design an elaborate Relay system to handle the 60 Amps current. The reason it is elaborate is the polarity is switched to the motors for up and down requiring diodes and diode switching circuits.
This is my belief.
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