I'm coming in to this very late and I didn't read many responses so I am going to type and see what the group thinks......
Given the scenario, pt needs to be intubated via RSI but lets hold the Etomidate, why..... because it works on the adrenal cortex and could HYPOTHETICALLY reduce the amount of epi/norepi helping the sympathetic nervous system. RSI the pt with Ketamine, Succ and Fentanyl........after confirmation and checking the BP use Versed (midazolam), and fentanyl for sedation with maybe ROC as necessary. Standard Vent settings 6mL/kg, 5 PEEP, 10 PS, Fi02 80% (ween to ETC02 40).
Meds in addition to sedation, TXA. Watch the BP because we don't want in to get too low (Monroe-Kelly doctrine).
If you have an aircraft service worth anything an auto-launch should've already been accomplished given to mechanism alone with a van in the crash. Even though this pt has an obvious HI rotor wing transport is not contraindicated. Pt with a pneumocephalic would only be at risk for further damage because blood doesn't expand at altitude, only air.
My $0.02.