If you want powerful lights for moose visibility you want them over the bumper, or even better on a roof rack cross bar over the driver. If you choose to use the stock wiring harness that can be done too, just re-route the wires.
The problem is if you use new lights that are a lot more powerful than the stock, you might be pushing the old wires to their limits, and either you're going to fry a wire, burn a lot of fuses or just get poor light output from your new lights that should be brighter. The stock H3 fog light bulbs are rated to 55 watt, if your new light requires 85 watt, for example, that's already over 50% more power required to run through the old stock wires.
One easy way to remedy this and still use the stock wires is to have the stock wires going to a relay instead of a light, then on the other side of that relay you can run new, thicker and better wires that will handle the power demand of a newer, more powerful light. With a steup like that you can run very strong lights and get excellent output.
In Alaska everybody swore by Lightforce lights for moose avoidance, and their light output is trememdous, with very clear, defined illumination. Not cheap. On my Jeep I had good old Hella 500 but I had uprated 85 Watt bulbs, plus the extra relay and wires as I outlined.
'00 9-5 Aero SC - '96 900 SE Turbo - '87 900 i 8v
"Never argue with an idiot,
he will pull you down to his level and beat you there with experience!"