Detectives say a thief removed a wheel clamp, tow bar, lock and alarm before driving away with a caravan.
The caravan was stolen from East Haddon Hill, in East Haddon, sometime between 10.45am and 11.05am yesterday (Wednesday).
The thief is believed to have used a red saloon car, which police say is similar to a Citroen Xsara, to tow the caravan away.
As well as the security measures, the thief also took the number plate.
The thief is believed to be a white man with light brown hair down to his ears.
The caravan was a white Eldis Crusader Super Chirocco twin axle with a black sticker stripe on both sides.