As you know, I like my 12v Wavebox micowave for warming up the Snugglesafe in chilly weather - as used in your driveway.
I also have an assortment of 12v
battery chargers eg for camera batteries including a universal model which will charge all batts which have their contacts on one side (not sure about the chipped batteries however).
I also run a 12v powered coolbox (no space for a fridge in the Roo) and, a more recent addition, a 12v fan although this combined with the the air-con isn't coping with the current heatwave any more than I am and this weekend's jaunt has had to be aborted! (Bring back last week's Scottish hail and sleet.... all is forgiven...!)
We had thought of a fan for our autumn Europe trip (assuming we go) - and we don't have Air Con. but we may be late enough that it won't be a problem
We have basic needs - but with a small van and minimal storage space for gas the more we can use the 12v sockets and instant barbeques etc the better, particulary when we are on the continent - in Scotland we are never away for more than a few days at a time, so space is less of a problem.