Joy, if you can make a list of the appliances which you intend to use, the rating or capicity of your fridge if it requires power to run it, is your lighting LED or not, what will your heating be in winter, whether you will be full time summer and winter or is this a holiday caravan, then some clever people here may be able to assist you with the minimum solar supply you will need. If you have the power ratings or consumption ratings for each appliance that would be helpful as well. Try and think of most things, a vacuum cleaner, a slow cooker and toaster for instance if that is your choice.
This will also assist with suggestions for the size inverter and the type or size batteries and most importantly how much solar you will need for trouble free days on the road in your new caravan.
For instance we run a 800watt electric toaster, and a small food processor and food mixer when required, Electric blankets for a short time before going to bed when it is midwinter and freezing outside, our Nespresso machine uses mega power but for a very short time and needs a minimum of an 1800 watt pure sine wave inverter to do this. My hairdryer is a 240v little travelling model it does spike up the power useage , again for a very short time. The slow cooker uses very little power but it does that for a lengthy period of time.
Hope these ideas will give you some ideas to get you started.