Going to Halogen is a good recommendation , checking the voltage at the back of the lamp is fine advice. Doing the relay modification if the voltage is low is a great fix. Bare in mind headlamp light power is governed by US Government Highway Standards, You are restricted to the maximum watts per headlamp. Adding auxiliary lamps is ok if directed properly . Somebody suggested aiming headlamps 'hot spot' 30 feet to the ground in front of your rig , dumb suggestion. After changing forward lamps find a building with a level area in front of a wall to shine your lights, keep back 25 to 35 feet and shine the lights on the wall, measure the height of the lamps and measure the height of the hot spot on the wall, adjust so the hot spot is slightly lower a few inches. Also aim them slightly to the right.