It's just not worth wasting a minute on this thought of ATVs on the open space carting around anybody. Even if someone did trailer an ATV to the open space parking area, or steal an ATV from the neighborhood, the nosy neighbors/hikers/rangers/etc would be all over that person like a swarm of bees. It's just not done. Plus, not to be crass, but if you want to dump a body, go West, not East. Spruce Mountain is East--it looks like wilderness but it's not. There are trails all over the butte, it's kind of like an island in the middle of the prairie, it is not a place to hide a body. Even the caves are known. I was very relieved when the search moved away from the western slopes--the gateway to 1.2 million acres of Pike National Forest. Now, someone intent on hiding a body could do that here. But it would have to be orchestrated for someone from outside this area to do such a thing. I'm only posting as a Woodmoor Mt local to provide, hopefully, some helpful "real world" viewpoints. Having said that, yes, indeed, anything is possible.