If the Exploder was that messed up, then why even bother denting it? You should've slashed all four tires including the spare. Just kidding.
When you left that space between the Armada and your truck, you were practically inviting someone to park in between the two vehicles. People seem to be attracted to middle spots for some reason. If you park on an end spot, you have a better chance avoiding damage.
You can call a PDR (paintless dent removal) professional and have them remove the dent. It costs around $75 bucks. I got a dent in the rear door (KC) of my truck and the guy completely removed it. It was in a tricky spot because it was right in front of the door impact beam. At the time, my truck was the first Titan he'd ever done.
The funny thing is, I got the dent in my own driveway from a family member selling a vehicle. The people who were looking at the car opened the door after "test driving" it and slammed the door right into my truck.
