FYI-I came across a potentially useful bit of equipment in the form of a 12v multi outlet power box being sold by 4WD Supacenter. The unit is a 'Kings" brand.
It is selling for $174.00 and includes multiple cig sockets and USBs, fully fused and has Anderson sockets and a volt meter. It looks pretty well made.
https://www.4wdsupacentre.com.au/pro...erm=10cashback