I’m Gas Safe Registered but only domestic natural gas, not LPG. I’m not ticketed to work on boats or caravans, which may encompass campers.. I have a photo of the back of my Gas Safe id card, and also a bit of a mates services who does LPG domestic and commercial. A while ago I was asked to fit a hob in a converted lorry that someone was living in. I didn’t do the work as any problems in the future I could be in big trouble as not specifically qualified and should know better. I did tell them all the safety considerations and not to listen to folk who say anybody can do it. Probably anyone can do it , not necessarily safely.