Originally Posted by JONBLEACH
I thought my prayers were answered from what you have posted.
I just tried that trial 3 times now and havent gotten the achievement yet.
I dont think there were any cars with 4 ppl in them. I would even blow up 2 cars with one rocket and nothing. This is the hardest achievement for me right now.
About half way through the trial in the lower left there is at least one truch carrying 4 people.
Also, you can try to "work" people into a group. Shoot next to them, and get them to funnel towards each other.
I literally got it on the first time playing that trial. Sorry you're struggling with it.