I've done a couple. One set is in the motorcoach. They're 5" x 7" driving lights that are set into the front air dam. I HAD photos hosted on village.com, but their site has died. (Taking about 800 of my web photos with them!) So much for showing you pictures.

I replaced them with 5x7 tractor lights with a trapezoid pattern. I removed the original H3 bulbs. (The lights were new) I had to make the access hole larger in the back to accommodate the HID's wiring, and seal them in with silicone. The ballasts are mounted up under the front of the bus. The trapezoid beam makes a sharp cut-off at the edges so they don't bother other drivers. The beams are close in, about 50 ~ 60 feet out, but the fog and yellow pavement lines are in "daylight" even in heavy rain. Reflective road signs pop out too.

I haven't done any KC lights, but the idea would be the same - remote the ballasts somewhere else. It would turn them into virtual flamethrowers too.