The cable range will depend on what cable ranges are already defined. Do the local network and remote campus already have zones and cable ranges assigned? If so you'll need to use a cable range that doesn't conflict with the current assignments. I usually use high numbers for wan links and assign a zone name that begins with a "z" so that it is forced to the bottom of the list in the Chooser on the Mac's.
Also, depending on the speed of your link and the amount of Appletalk traffic you have, you might want to consider using a GRE tunnel for your Appletalk traffic. I'm doing it in several locations that have multiple links and the Mac's have less trouble dropping links. A typical config is:
interface Tunnel0
description AppleTalk Tunnel to Remote router
no ip address
appletalk cable-range 45100-45100
appletalk zone zTunnel0
tunnel source 10.45.10.1
tunnel destination 10.36.20.1
