CTEK D250S Dual
I've wrote a new article about power consumption, while on the road. Whether you need to power supply your fridge, or when you need to charge your batteries. For being as long as possible self-sufficient, you'll need a strong power system, which is reliable enough to keep you devices up and running.
With the CTEK- D250S Dual & the Smartpass most of your problems will go. While driving, the system charges all batteries with full force (and much faster than with only the alternator) and the solar panels are supporting the process.