Thanks for your thoughts on that Kevin. I've been online most of the evening reading about and viewing various setups. Some say matched batteries are ideal, but not all. One scenario that keeps coming up often is that when you start the vehicle and charging begins you do not want to have one battery deeply discharged as the starting battery (or both) will be affected negatively. But an isolator such as a voltage sensitive relay may provide the protection for that.
The reason I plan to wire the system is to make my truck something I can take into the hills to camp, fish, ride my dirt bikes and such. I'll be running lights, audio, two way radio and whatnot. Also like the idea of having a backup battery for starting. Probably put a winch on also. So I'm just trying to sort out the details. Lots to learn.
