I have used and supported AutoCAD and Autodesk products for years and
have never seen any documentation stating any kind of support for
touch screens. That being said using AutoCAD on a touchscreen would
not be very practical from an accuracy standpoint. I also supported
150+ Panasonic ToughBook touchscreen laptops for the utility company I
retired from. The app the servicemen used on the touchscreen on had a
very big, relatively simple interface. The AutoCAD interface does not
work well at the low resolutions required to make on screen buttons
work with fingertips. Accuracy would be out the window trying to
control the cursor and snaps with your finger.
You may want to contact RockWare software, www.rockware.com. They make
a CAD program that runs on Windows CE, the mobile version of Windows.
They may have a version that would run on your ToughBook.