Just throwing in my $0.02 here because it's mostly personal preference and this is the system I like to run... I've had this system in two other trucks over the years and is incomplete as of today in my tahoe. Personally I hate solenoid based isolator systems, two main reasons are 1. moving parts = failure potential and 2. the batteries are connected together while the solenoid is on (I know this doesn't matter while the vehicle is running and charging but again, failure potential). I prefer an diode based isolation system which has no moving parts and (baring catastrophic failure) will always keep the batteries isolated from each other. In the event that I might need the two batteries to connect I have jumper cables...
As I stated before this is incomplete (Need more money for a another battery and a new isolator (the isolator should always be rated higher than your altinators output and this one is not) plus some fuses... you safety 3rd and all hahaha)
