I have a bar fridge under my pergola at home.Has a door on the little freezer and freezes well.
During the 40 plus days last, bushfire season beer was around 4 degree,s.
Pick up a fridge, the size you can stand up when transporting. Sometimes leaving them rest can take days
Get one that has an exterior cooling coil.
Keep in the shade and do not open every minute.We cover the top of our trailer mounted Esky with 2 glued to size windscreen shade,s
Sometimes leaving them rest can take days.
You see standard fridges in powered spots everywhere.
Check the camp site will not charge you extra.