Here's a chiller for you, totally unconnected with caravans but I'm sure his lordship will be interested.
My brother-in-law used to work for Berkshire ambulance service and on one shift was forced to take the spare ambulance out as their's had broken down. After a few miles they heard noises in the back but couldn't find any loose kit and as they were not on a job both Len and his mate were in the front cab. Several times over the shift this happened and also the heater wasn't working either.
On return to the base they were greeted by the manager to say that tomorrow night they had got their old ambulance back as it was fixed. Len remarked, great because this one is like a fridge with the heater not working. To which the gaffer replied, the heater works fine. Two bemused ambulancemen were then asked if they thought anything else was wrong with the vehicle, and they told him about the noises. His reply was that the ambulance was haunted and that there was absolutely nothing wrong mechanically with the vehicle.
I do hope I've not put anyone off using a converted ambulance.
Steve L.