Run van air con on camp site hook up

Hi I wanted to run my vans air con whilst at a camp site. If I install a mains hook up and run a charger to my main battery would that work. Would I be able to put enough power into the battery

Is there no way to plug it in directly? I don’t have air conditioning but my brother does and he only runs it when he has a land hook up, he has a multi plug he uses to divert electricity to the air conditioner and electricity to charge his batteries separately.
Good luck & welcome to the forum!