Although I struggle to think like a killer....
I am very reluctant to believe that DS hauled VS body all the way to Ohio. The presumption that DS watched the kids board the bus, then call VS on the phone (pretending to be the mailman), then snatch her and strangle her to death, wrap her in a tarp, load the dead body in his truck.....then presume he kept her in there for 2 hours while driving on a major highway??? I can't imagine!! I would sooner believe he wanted to get rid of that body MUCH sooner, and not risk getting caught with it. I can't imagine he hauled her body all the way to Ohio before burying her. I think he either just dumped her body or at least buried her CLOSE to the Colon area. As I've said before - it happened in the peak of field planting season - the HUGE fields near Colon would have been freshly plowed - VERY EASY DIGGING - so he could easily dig a shallow grave and stick her in it. Then within a week the farmers would plant that field, so she could be buried under a field of corn or beans, and not even have that field plowed up for at least a year. That may NOT be where she is, but it seems more likely to me than hauling her body all the way to Ohio somewhere and risk being stopped by the police AGAIN. Apparently he was stopped just a week before and had to call off the 'murder mission'....I can't imagine he would risk being caught on this one by carrying the body on a main highway where he could get stopped, or get in an accident with a dead body in tow.
JMO