Are you looking for the factory skid or aftermarket. Look for a skid for a 4-Door. Nothing different regarding skids for a Wildtrak or any other 4-Door.
I did floods on both. The distance on the floods is so far out there it is amazing. I needed the spread of the floods. I have a place in NW Montana where there is zero ambient light and a buttload of deer. I wanted to make sure I illuminated both sides of the road and reach out as far as...
I have seen a couple of reports where it turned out to be the rear axle bearings. I notice it most from 55mph-65mph. Above 65mph it starts to go away. By 70-ish it's gone.
You have the worst case scenario. High ambient heat, high demand on the drivetrain, and minimal air flow for the heat exchangers. As Duc suggested, your best best is aftermarket radiator, external oil cooler, and external trans cooler. On the oil and trans coolers, get the versions that have...
Buy the Bilstein 6100 series. Run at the lowest setting they will be right at the stock ride height and far superior ride than you factory setup. Very budget friendly.