Unused caravan-can you save costs?

hello, we got a caravan 2 years ago. since then we only used it once (at the beginning). then came the winter, I was pregnant, with small children we did not want to travel cramped. now the winter is again in front of the door and we will only use the caravan again in summer (but then really) we pay taxes, insurance, parking fee and the tv is overdue. the car stands on a private property and has not been moved for a long time. n we want to talk about new tires on it, tüv fee. can you save some money somehow? is it worth logging off a car? can you even log off a caravan without tüv? doofe ask I know. but we are currently only putting money in and have nothing of it. I am grateful for tips