Heads-up on DFW: while as of last weekend, D was the only terminal with the scanners in use, they have been installed at most A & C checkpoints, and are only awaiting TSA training before they go operational.
Here's the current info from the sticky thread:
DFW - MMW in use @ ALL D C/Ps - Installed @ A21, A36, C8, C21, C31 (left/main lane) - SAFE A12, B9, B19, B33, C31, E8, E15, E16, E33 - B24 in progress
You didn't say when your trip is, but definitely re-check the sticky thread just before you leave.
All the DFW terminals are connected airside by the Skylink, which runs in both directions A - C - E - D - B - A, with the A-B and D-E rides slightly longer than the others. The max ride time is 9 minutes.