[Bren]

Without reading this thread, a shoulder holster or cross-draw holster is easiest to use while seated in a car. An ankle holster also works and I do know a guy who shot a guy with the gun in his ankle holster because his car seat blocked him from drawing the one on his hip (which will happen if you have to duck down below the dash for cover, since that puts you on top of a gun worn on your strong side).