sorry but a caravan is probably worse than a loft, have you ever come back to one after the sun has been on it or when its cold or wet? most are extremely affected by the outside temp. You need to be looking at getting a fridge, maybe a free one from freecycle but it needs to be ran for a few weeks to get the temp right, as well as heat being bad for them to cold is as well hence the need to have somewhere thats a steady 5c give or take a couple of degrees. Does your caravan have a fridge? you could try putting using a digital thermometer to see how that holds its temp but I don't know how good those fridges are.
|