Looking to get some new tires for a Mercury Mountaineer 2WD (basically a fancy Ford Expedition). We go shooting out in the desert, not any serious off roading or anything. We stay on the trails. Are All Terrain tires necessary, or are we good with just some all weather tires? The vehicle has decent ground clearance. Only lived here in the desert for 2 years, so kind of new to all this off road stuff.