Easiest way involves 2 vehicles. Attach a pulley on the rear bumper of one and run the strap/rope through the pulley and attach to the hitch of the second vehicle. Tie the other end of the strap onto the elk's antlers. Now get two walkie talkies (one for the guy at the elk and one for the guy driving the second truck. Drive up slow and stop when the guy on the walkie talkie tells him to stop so he can reposition the elk around obsticals. Seen it done on an elk I killed in Montana

I suppose you could do it with only one vehicle if you could attach the pulley to a tree, etc