Thanks, and I agree, shouldn't have happened, but.....it did. I doubt very much if there is a manual override to release the e-brake, however if you fix the reason the truck won't start, the brakes will take care of themselves. I had to laugh at the tow truck driver though. He said he has had this happen to him before and he just disassembled the rear brakes to release them. I told him to put his tools away, because that wasn't happening.
Don't they carry a couple of wheel dolly's to allow getting a vehicle on the flatbed when the wheels are locked? I would think this is a lot less work than what he was going to try!