For those still concerned about the iconic tour vehicle, there are a couple of pieces evidence further supporting their inclusion. The first is a screenshot of the Park Tour building that players will have to construct when playing the campaign, challenge mode and sandbox; it’s worth noting that the Ford Explorer is used as the icon for this attraction.
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The second piece of evidence comes from GameRiot's video. GameRiot was also present at the same event BestInslot and Gaming Beaver went, but he was the only one that both repaired and constructed the Park Tour. At 11:49 in the video, the icon for his mouse hovers over the gate through which the tour vehicles pass through and its default name is called “Explorer Gate 1”.
Source: https://m.youtube.com/watch?v=Q5GKLjP_7Hw
To sum it up, it would be very unusual for Frontier to have gone through the effort of creating the icon and naming the gate but not the vehicle on which they’re based on.
But why haven’t we seen the Ford Explorer yet?
I believe there are two theories to this question. The first being that in the dev build that the YouTubers played with, it simply wasn’t ready to be shown yet. The build itself was only a month old and did feature some unfinished features, BestInSlot reported the JP/// Male Velociraptor's skin wasn’t complete. Perhaps Frontier are currently using the Jeep as a placeholder and saving the Explorer for the DLC's release trailer.
The second theory is that perhaps when we start off the Return to Jurassic Park Campaign, the Park Tour doesn’t start off with the Ford Explorer but instead the Jeep Wrangler. As the campaign goes on, we’ll be able to research an upgrade for the Park Tour that replaces gas-powered Jeeps with the electric-powered, track running Fords. This is potentially supported by GameRiot's video at 12:43, where he rides the tour. During his brief ride, there is no electric track in the middle of the road and we hear the Jeep's engine sounds in the background.
In conclusion, I believe the Ford Explorer is definitely in this DLC.