I’m just wondering why people feel it necessary to fit a domestic consumer unit to their van. As far as I know all EHUs are fitted with RCDs and and, I’m thinking most people would not worry at all about using an extension lead from their house on the van - so if you have RCD protection and you have additional fuses for your separate circuits (only lights and sockets) why bother with the expense and inconvenient bulk of a CU. I’m happy to be enlightened.