cuz you need to insert the key to unlock the steering wheel and when you do that certain accessories come alive...probably the clock and maybe some others.
some things to review and/or think about doing to remedy this:
- IF your 2008 liberty has an UNLOCKED/OFF position on the ignition switch you will not have to disconnect the battery. our 2003 jeep wrangler has such a feature so while we have to insert a key to unlock the steering wheel nothing is powered up when we tow. your '08 lib may or may not. check your owner's manual.
- the steering wheel on our '10 lib does not lock which means that we can tow it without a key in the ignition which means not having to disconnect the battery. check your owner's manual under Recreational Towing.
- assuming neither of the above work out for you then you should be able to add a charging line between your MH and your lib's battery. this will keep the battery charged while it's under tow. other's on this forum have done that with great success and they can guide you as to the specifics.
good luck.