I am thinking of riveting a couple of neat looking round brackets to the doors then securing them with a neat looking chain, maybe with a nice sleeve. Basically I can clip on a motorbike size chain to the doors at night which is fastened to the body somewhere. Or for example, link the passenger door to the sliding door by chain so that nobody can open them. The idea will work but has anyone any better ideas, that look neat or professional? I’ve seen both front doors secured with a long bar but I don’t fancy having to carry a big bar around. Off the shelf solutions often mean cutting and drilling and are pricey.