Master Cyl and Brake Question

[68_Step]

On my 1978 K30, I have a switch called a "Mico Dualock" mounted on the dash. I googled that and it seems to be a supplemental brake system. Then I have what I think is an electrical trailer brake setup hanging under the dash.

I have a lot of "extra" brake stuff under the hood, which I am guessing is part of the Dualock. There are extra brake lines that have been tapped into the master cylinder lines and they run to something else (pics below) on the inner fender, a vacuum line (i think) leaves the fender and heads under the dash.

This is a flat bed farm truck that does farm type work and it always fun to drive something with a 454 in it. I am not a commercial hauler and the extent of my hauling is fence post, hay, cars, tractors, and cattle trailers.

Anybody know other than additional braking, why a 1 ton would have this kind of brake system?

I would like to remove it completely, seems to be disabled / non-working anyway. Other that bleeding the Master Cyl and wheel cylinders again, is there a downside to removing it?

It that box hanging under the dash with the black knob an electric brake system for trailers?

Thanks!