In a word, 'yes'!
Why? Because although they did find 'a' green truck, only evidence will prove that it is 'the' green truck. People HAVE in the past been wrongfully accused and even convicted here in this country. It has happened numerous times. It has happened that police focus on one thing, and then look for everything to fit neatly into that one thing, instead of looking out at everything to see where that everything may lead.
Police were tipped off that DG owned a green truck similar to the one pictured in the 2 photos released by LE. LE then went to the property, found DG's similar truck, took it away for examination, and took DG in for questioning. A day later, DG was released from questioning, because at that point LE had no choice but to let him go, or charge him. They did not have enough to charge him at that point, so they released him from questioning. If the truck had blood in it, which it presumably would have if these bodies were dragged down that stained walkway, LE would have seen it, and would have arrested him. Instead, in order to keep him detained for longer than they could rightfully detain him in regard to the murders, they charged him with the fake ID/impersonation charges. He was later released on $750 bail. By that time, LE had been combing his property with a fine toothed comb for days, taking whatever they felt could potentially be evidence, and re-arrested him after he was let out on bail, charging him with the murders and saying there was no smoking gun. Blood or evidence in the truck would have been a smoking gun, I would think, IMOO. We don't know if the truck was returned, or if DG would have to pick up the truck from a compound somewhere if it had been released, or if LE is keeping it as evidence, since LE is being very tight lipped about everything. Sometimes, what may seem like common sense, makes people come to conclusions before an accused has his day in court. I, for one, am dying to hear about all of this circumstantial evidence they have gathered, before I reach a guilty verdict.