Like a previous reviewer, I find this a perfectly acceptable and useful deterent device. I've purchased and used a variety of Pacsafe products and have liked them all. I've never seen them claim to secure a caravan(?!) with a product like this - it's intended for relatively small items used on the move. This is what Pacsafe specialise in: first-line security on the move. If you're a tourist or a leisure walker or, like me, a motorcyclist, their product range allows you to give your kit some measure of deterent security so that it's less easy for the casual thief to get your stuff - they're more likely to move on to easier prey! In reality there's very little you can do to protect anything from someone determined to have it - so, as any security expert will tell you, deterring is the name of the game.
So this device is great for securing at risk items (in my case a tank bag or pair of crash hats) for short periods on days out. And if you use it properly, as per the instructions, it works fine. I'd recommend it as fit for purpose and good value.