solar setup

HI

just in the process of building a day van/camper, currently have 240v hook up, 3x110ah batteries and running led lighting and a 75w 12v fridge, looking to add some solar but not wanting to blow loads of money on it. Really looking for something that will give sufficient charge to the batteries to allow me to run the fridge all the time and keep it cold overnight and charge a phone/lights on for a bit of time each night.

All based in a LWB Crafter van so have approx 3m plus width of the vehicle of space on the roof, first proper trip will be to le mans in June so 4/5days on a campsite with no hookup but i do have a petrol genny to top up with but its not a very sociable one so want to limit the use of it as much as possible.

what do people suggest as a complete kit?