Hi Webhead
If you book your rental as part of a Walt Disney Travel Company Package through Dreams Unlimited Travel then yes, the cost of the rental car would be eligible for the rebate as it is included in the total package price.
However, Dreams Unlimited Travel currently does not book rental cars outside of a Walt Disney Travel Company package so if you wanted to add a rental car to a room-only reservation you would need to do that yourself and then that would not be eligible for the discount.
The best part about using Dreams Unlimited Travel in conjunction with DisSavers is that you can request a quote both with and without the rental car - and see what the rebate would be - then you can make an informed decision as to whether or not booking the rental car this way is the most cost effective.
Thanks
John