I found the link you posted to this unit which I'd missed 1st time around.
It does look like a neat solution, but try as I might I can't quite get my head around how it does what it does. I've watched the video & looked at advertising material, & even a couple of youtube video of self installations.
Sooo.... the switch box replaces the need for multiple relays in multiple circuits. A relay utilises a a thin cable & low current to operate a 'switch' to carry higher current via heavier cables between power source (battery) & the 'appliance' eg. driving lights. There do not appear to be any relays in the 'control box', it looks to be a box containing multiple fuse holders & fuses with common busbars? So nothing in the control box is switched? If so then all the switching must be done inside the switch panel inside the cab, but that is where I'm confused. Depending on where you look, the unit is supplied with either a 60amp or a 100amp circuit breaker meaning that this is the unit's max capacity. But the cable running to the switch panel, doesn't, from what I can see look anything like heavy enough to carry that sort of current. I also find it hard to believe that the 'micro switches' would be intended to pass currents of up to 30 amps,
but it's possible there is something about micro switches I don't understand, never having used them. Somewhere in the 'system' there surely has to be something capable of switching up to 30 amps dc at a time, & this needs to be fairly robust to resist the tendency to arc that dc has at that level of current.
I'm sure the product must be suitable for the job it does, just wondering if you, or anyone else can throw any light on how it does it for me? It's got me interested.