Hi

Is there a good source by a QUALIFIED person detailing how and why to set up the 12v power and charging systems for cars/caravans?

I was googling what I thought were simple questions such as: adding an Anderson plug (should it be of auxillary battery, what if that battery is charged via a 20amp DC-DC charger - how can you take advantage of a high output alternator (i.e. 60amp at plug); how and should you charge van batteries while driving but have the fridge run off vehicle then switch back to van when ignition off; real world testing of DC-DC chargers in vans Vs simply via the car alternator etc...
Seemed like pretty simple questions to me but all I found was caravaning forums filled with BS and arguements.