Caravan Wheel Clamp or Hitch Lock (Mapperly NG3)

Hi, would anyone have a spare Wheel Clamp or Hitch Lock for a caravan please.
I'm collecting a caravan today for a friend to live in, he has recently become homeless due to astronomical rent increases. A kind gentleman is donating his old caravan so he has somewhere to stay while he gets back on his feet.
Looking for any kind of security device(s) to help secure it if anyone has anything that would help.
If anyone has anything else that would help him make life in the caravan more comfortable, from blankets, camping heater, rechargeable light, part bottle or end of bottle of propane calor gas etc, anything that might help is appreciated.
Thanks In Advance