It looks to have been a Ford Explorer based on the headlight area.
I just read an update and it looks like all the kids will live. 4 of the 5 previously listed as critical have been upgraded to stable condition.
From the names I’m guessing one is the son of one of the guys I used to run with as a kid. (doing the same crap)
What there were doing was getting airborn on a dirt road with some steep sharp hills. We used to do the same when I was a teenager.