dual battery

I'm curious if anybody has a dual battery setup in their Ranger for camping/overlanding. I'm going back and forth over a dual fuel 2000w/1800w generator/invertor or a dual battery setup with possible solar back-up charging. I'm also wondering what the stock alternator can handle as far as...

I've got a redarc DCDC charger and a second battery in my bed. The charger has a wire that is intended to connect to an ignition source so that it knows if the engine is running and will charge the second battery when it is. Has anyone found a good way to connect this to their truck? An open...