I'm guessing that is how there is no need for the wide load trailer during shipment. When they are down it would probably cause problems with other traffic.
I had thought this phrase "The SAM will also serve as an anode skid, designed to carry additional anodes." meant the SAM would carry additional anodes to the sea floor (on the wings) but perhaps the "additional anodes" are the four built in anodes we see on each SAM. So the questions still stand, when 'retracted', what is their purpose? when 'extended', what is their purpose?