Well what we do know is that he had at least two vehicles, the pickup and the white work van. When LE were there on the second night, the red pickup was in the garage. So where was the work van? Did he leave it on the street so that he could put the truck in the garage and then move the van into the driveway? Did he take the red truck out at all? There appears to be a white van on the road in front of the house parked behind a police car, and it's on the road in front of where the door to the house is, not the garage. It's quite possible that it is an LE vehicle.
So what we need to know is what was his regular parking habits. If he needed the van for work the next day, and he had been using it for work most of the week, wouldn't he just leave the pickup in the garage and park the van in the driveway so he wouldn't have to shuffle vehicles in the morning. Do we know if he had a single or double car garage and driveway. None of the pictures I've seen seem to show this.
Here is a screen cap of DS2 and the truck in the garage on the night of the search....
I'm also trying to figure out what that "box like" object is in front of them.
Here is a screen cap of the vehicles in front of the house the same night...
It's pretty dark but perhaps someone with photoshop can lighten that up for us to see the van better.
ETA: These pics were from the second night, the night of the search
Screen caps from this link
http://www.wftv.com/news/news/police-search-33-year-old-missing-woman/nFg3d/