Commercial vehicles on site

hi every one. I'm Alex . After a few years of tenting I'm going to buy a caravan. I've buying a big hobby, Iv seen a few theads mentioning that I can be seen as a travellers van, that's fine by me. But as a landscape gardener I'll be towing with a double cab tipper. Haha, so it could ruin a holiday if I turn up with 3 kids and get told to leave. Do I need to ring and check if I'll be allowed on site first. cheers