Re: Dual Battery Options?
Dual battery systems in the WK2 are definitely doable, you could go over to the export section where the Aussies hang out and search dual batteries there, or the Towing thread. Lots of info.
I made a decision not to carry a second battery all the time, it goes in when the fridge is loaded when travelling.
I made up a false floor that fitted the load area and mounted an 80ah AGM in a battery box - this is fixed to the false floor behind the fridge. An Engel 40l and the battery will just fit in line behind the rear seat.
Tables and chairs and a storage drawer all fit onto the false floor- takes only minutes to install or remove the lot.
I used a Piranha 140a isolator mounted down beside the main battery and 6 B&S cable with an Anderson plug to connect to the battery. I can either connect direct or via a 12v DC to DC charger mounted on top of the battery. Using the DC/DC charger will eliminate any issues with the charging regime of the main system.
This has worked well for us for three years and 85000K, I wouldn't change anything if I did it all again.
Good luck with your trip, it will be great.
2015 Laredo CRD
Billet Silver with Quadralift, front recovery hook, Mopar towbar
Upgraded from 2012 CRD that did the job brilliantly for 4 years
1975 Holden HJ 308 Monaro 4dr - oldie but a goodie