BTW there are two types of caravan these days, the one I mentioned above which is a fully self supporting truck, manned for arrivals and departures and back up to air traffic control. The second is usually a trailer or towable affair which is used when the main air traffic control is closed or unmanned, usually for glider or trainer aircraft use. This has been around for a while and I wonder if this is what is shown in the picture taken at Leuchars.

Also there was the GCA / radar, PAR, and standby local (usually fixed and semi burried) caravans – they’re another topic.