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If you go on Ebay and look up split charge relay, you will pick up a kit for aroung £18 that will top up your leisure battery whilst driving around, but more importantly it gives charge priority to your cranking battery to ensure you can start the van. If you plan on "wild" camping a split charge system is imperative. It will also run the fridge whilst the engine is running.

I also fitted a combined smart charger / 12v transformer from a caravan and made all my lighting 12v, so when on mains power the power it powers the lights and when on battery they run off the leisure batteries.

The Self Build Motor Caravanners Club (SBMCC) website has some good forums and wiring diagrams for this.

Hope this help.