I order two this past summer. One for the crew (may as well start off fresh) and one for the 90 as a spare. They are good quality. I would still recommend running lights and headlights on a relay though.
Good diagram Ray!
My trailer lights were already split off on a separate switch and I had no extra lights.
I burned one a few years back running 55w/100 bulbs in Cibie housings.
My headlight switches are now safe running the Trucklite LED headlights which pull 1.6amps on low & 3.2 amps on high...no relays, no harness, no flicker when the grid heaters are cycling as they have max output as low as 8v.