Hi @Mike-And-Jane0 if you provide a service and get paid for it you are running a business @Barbara3366 has both a caravan and a self contained studio.
@Barbara3366 if you and your partner are generating less than £31,000 including wages, your STR business income and benefits between you I would ask for your benefits to be reviewed as this sounds far too low .
your description says you offer a self contained 3 bedroom caravan and two self contained rooms in the house so this wouldn't come under the government's rent a room scheme .