I have a pro 6 and the serial number is stamped on the frame. Its a bit worrying all these vans being nicked, i also know of a van that has been nicked in the Bedford area a few months ago. The bloke who nicked it was caught on CCTV. The van and system was not recovered i had a long chat with the guy and he told me how good Alexander swan are. He got his Courtesy van the next day, carried on working till his claim was settled. He now has a Tracker fitted paid about £450 then around £180 a year subscription with the middle of the range package.