Near the front of the trailer there is a fixed tower/platform on which the grapple's arm is mounted. Underneath that is the works for the winch: hydraulic drive, gearing, spool for cable, etc. The cable runs from the spool up to near the top of the tower, where it comes out of the tower in through a block that can pivot left and right to direct the cable.
The first picture is copied from the Metavic brochure. It shows the winch block with the cable stretched out to a log.
The second picture is zoomed in on my trailer. The small blue circle shows the winch block near the top of the tower. The larger yellow circle indicates where the guts of the winch is housed.
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Now I see the light, thanks for posting:thumbsup: