First I'd get rid of that guard on the front, cause the first small thing you hit will damage your whole front end, also, use some woolwax, and spray your undercarriage
I think as long as you use 12-10 gauge wire with a good quality relay you'll be ok, between mine, (light bar, large round bumper lights, ditch lights, another set of led bumper lights ) no hot wires even when everything is on. Just relay each light or set that you hook up.
if there's a Cabela's or Bass Pro close to you try that, they've got a basic roof basket pretty cheap. I had the longer version of this and works pretty well
Cabela's TrailGear Rooftop Carrier : Cabela's