Do you have a lithium power bank Like the EcoFlow River or similar? With the Victron chargers you can use the "load" output to charge your power bank as well as it charging your leisure batteries as normal. The Victron prioritises giving your leisure batteries a full charge at least once a day whilst also charging your power bank via the load terminals with any spare power. You can even manually specify the exact minimum voltage the Victron will charge your leisure batteries to before it enables the charging of your power bank, giving you full control of how much priority your camper batteries have when solar charging.
If you want to do this we can supply a female cigar style socket on a cable for you to plug your power bank into.