Be sure to safely secure all loose objects before travelling, this should also include shutting all internal doors, cupboards and fridge door.
Disconnect or at least switch off the gas cylinder and empty any waste or fresh water tanks.
This also includes animals and you not advised to tow your caravan or drive your motorhome with animals in the living area.
Make sure the roof lights are closed down.
Aim to take what you need, as a lighter load will keep your caravan more stable and may help a little towards saving fuel.