We ran both amber and white LED strobes on our mowing tractors, you can see the white from farther away in my opinion. Also autozone sells a small amber/white combo unit that strobes randomly to keep it interesting. We put those on the back of our trailer, worked great. They're like 3"x6" and you can see them from very far off, it wouldn't be hard at all to cut a square out of the bumper to stick them in(they're hardly noticeable when they're countersunk). And when you're ready to sell the jeep you could easily stick some auxiliary reverse lights or extra brake lights in there.