Forget those Caravan AIrcond's.
Bloody expensive. Not very efficient nor economical to run in relation to others.
AND. MAINLY VERRRRY noisy.

LG and such do nice slimline. Inverter units.We've proven them bouncing round in fishing boats at sea.
VERY good for vans. Compressor/inv unit in cage on rear.
I've seen one mounted under bed with in/outlet to outside horizontally.
That was neat. and, as he said.
Lovely warm bed. summer and winter.

Fairly easy to do if you half handy Just a bit fiddly, depending on van layout.
. then plumber to connect and activate.