Just thought I'd mention a reason DG might want to use Al's truck for transportation instead of his own as per Aljr statement here about the green truck
http://www.sunnewsnetwork.ca/sunnews/straighttalk/archives/2014/07/20140716-192250.html
"Liknes says if the missing trio was indeed taken in the suspect's old green pick-up truck, as police allege, then there's probably no need to stray far from easily-accessed roads and the fields and ditches that run alongside them.
Liknes knows the truck in question, and he says it just wasn't up to any serious distance driving or off-road excursions.
"It's a piece of crap truck," he says."
I was thinking more about timing and that he was more unlikely to come and go to avoid red flagging attention. Even in A's truck at odd times it might draw attention unless A did come and go at odd times in which case then using A's truck wouldn't draw suspicion at all.
If DG was coming and going, say to the acreage you'd have to consider time he spent initially at the L's house however long that was, then possibly 30+ minutes to the acreage, whatever time he needed there, then another 30+ back to the L's house for clean up....unless he stopped somewhere close by to drop off and return. However that said if anyone was to call the house if it was before midnight to touch base, check in and see if anything was needed for instance for NO and no one answered that could draw suspicion thus doing everything once and getting out would be more likely IMO.
If he didn't keep them on the acreage then he would also need dark hours I suspect to move them without being seen so he'd want to be in and out to allow for time needed that night to finish his plan.
I wonder if DG owned a trailer at all? Like one that could be stored somewhere or had access to one off property or near the L home.