no base camp, we usually camp on the way.
Here are 2 places that I know about that will help you portage your car or boat.
http://www.rochellescanoerental.com/ This is up near Possum Kingdom.
http://www.glenrosearea.com/rhodes/ This one is below Lake Granbury
I have used both of these services with good results from each.
For my 9 day trip I had a relative drop me in and pick me up.