[bewaretheirs]

No need for a new one; the two they built for the Apollo program still work just fine.

Note that the crawler-transporter doesn't hang around at the pad during the launch - after setting the mobile launcher down at the pad, it drives away back towards the VAB until it's needed next.

During the Apollo era, it also transported the Mobile Service Structure - a tower with work platforms that allowed access to much of the spacecraft on top of the rocket.