An electric only fridge is a poor choice for dry camping. It will take 300AH of battery capacity and 300W of solar panel production at a minimum. With lead acid batteries the 300AH will provide only 150AH for the fridge and everything else in the RV as going below 50% SOC will greatly decrease their useful life and increase the time it takes to recharge them.
For an electric only fridge the best solution is to invest in lithium phosphate batteries that can take a 80% discharge without damage and that can be recharged at 4 times the rate of lead acid batteries so the generator run time will be greatly reduced and solar charging will be more effective during the limited hours of daylight.