Trail: The touring models come with the wiring to plug into the HD cruise control module; softail bikes don't have the wiring. If you want to install a HD cruise control unit on your softail, contact Dave, the owner, of Cruisemount and he can supply the necessary wiring:
http://www.cruisemount.com/
xfasteddiex: The cable lash initialization is part of the installation for all of the pre-'08 touring models and there is no need to take it to the dealer to have it done. It is explained in the HD Service Manual's section on Cruise Control.