The S-IC rested in the Rocket Park on the transporter which had been designed
to move Saturn V first stages around in the 1960s. The transporter would
continue to serve this purpose, even after the stage would be moved indoors --
they just removed the wheels and related equipment and put the remaining frame
on support columns in the Saturn V Center.
Here they're in the process of removing the wheels from the front part of
the transporter. Note that the wheels of the transporter on the far side
of the S-IC had already been removed.
Picture 2 of 2.