My manual for the SRT6, states the vehicle has to be trailer on all 4 wheels.
Sure it would be for most Crossfires. I don't have the manual here at this time, wife took vehicle to work. Sure it said that if the vehicle has to be towed, must not be towed at no more than 30 MPH for only a few miles. When I get the manual I can get more info for you. Hope that helped