What may have also happened was that Rob or Rob and Leeann crashed the truck. Remember the hurt leg and showing up in town in the cab of either a transport or some other vehicle.and the. X-rays.
The escalade was parked on the side road at night and gone in the day. It wasn't there as a secret stash spot for substances. McRobb was parking there so she could spend the night partying and whatever else with Rob.