Looking for advice on which caravans I can tow

Hi All, Firstly please forgive my ignorance as I have never towed or owned a caravan before so sorry if I sound dumb !!

I own a 4.0 litre Landcruiser Prado with a towing capacity of 2500kg, however my towbar is limited to 2250kg, what is the maximum tare of a caravan that I would legally and safely be able to tow? I love the opalite 610 with shower and toilet just not sure if I can tow it

Thanks for all the help !!

Mark, SA