solar power for caravaning

We are looking at using solar power for our van and are not sure what we need to use to give plenty of power.I have a 2.0I honda generator which can run the aircon with the fridge and 2 lights at once.our idea is to use solar with the same or better capasity, in some cases when we're near other people that are close by or in national parks where generators are not permitted. and use the generatorthe rest of the time, any ideas would be very much appreciated or any pitfalls to lookout for.we're just looking at something mid range in price. thanks.

Ian Hopkins, VIC