Solar Power for Mandrake

Mandrake,
I am looking at buying some solar panels and just read your article in the news letter, I will need to run: 80lt Waeco fridge/freezer and some lighting its only for 2 adults so the lighting will not be a problem as we go off to bed not long after the sun sets to get a early start on the next day & the fridge is normally full and not opened that often (as i've been told that a full fridge/freezer is more power friendly than a half full/empty one
We have a 2nd 80ah under the bonnet and a 100ah in the tool box (both AGM) of our camper trailer being charged via 50amp anderson plug while on the move.
We may only need the solar as top up as we rarely stay camped for more than 5 days without driving the 4x4 or stopping in camping grounds and using 240v
I've thought about a 80w pannel is it right and if so what are the dimensions of your panel
Response will be greatly received