I have had a 120 watt folding type for a while with a set up to plug into the tug via 10 amp controller.
This was enough to keep up with the 100 litre trailblazer.... just.
Now we have toys, LED lights and a water pump, I have just got a 120 watt folding blanket from Jetcrew and have set up a 30 amp controller in the CT so I can plug both panels into it.
I did some calcs and discovered that the pump, lights and toys (mostly the toys) draw the same amps over a day as the fridge.