I've just wired in the cabling for the auxiliary battery I put in the back when traveling. I wired direct to the battery terminals via a 40 Amp fuse to an Anderson plug on short leads. I will then pull the Anderson plug out of the battery bay and plug in a charging lead to the battery - all 6B&S.
I also wired in a switch to turn on the compressor when I put it and the air tank in for trips. The switch is in the kick panel next to my right knee - next to the knob for the Redarc Tow Pro Elite that the dealer wired in.
Still stuffed if I can figure out how to do an Anderson plug for the trailer - might have to flick pass that to the professionals!
Cheers
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PS Must take some photos so I can change the profile photos...