Originally I had planned on just switching my primary side of the pack, but, I bought a second hand controll box with primary and secondary albright sw200 switches on the pack. do you guys still recomend a kill switch on the pack despite the two contactors and the KSI switch on the controller (1231c)? Isn't that a little overkill. What are the chances of all of them failing at once? even NASA dosn't design tripple redundancy?