It also has to do with the reflector shape. You could install relays and a direct hot to the battery. That will get more current directly to the bulb. Also go the 65/80 watt bulbs. I'd be carefull of doing that though. I melted a set of fog lights in a jetta once by putting in 100w bulbs. Id also skip the hid retro kits. The reflector was not designed for that and won't put the light where you want it. You'd just be poking involving drivers in the eye with the extra light. Most just add auxiliary lights to the truck, probably the best route. You can choose lights that fit your needs/ budget.
Hth