Ok, well how logical would something like a 1960 Cadillac 4 door be?
It has plenty of room for the 'goods' whatever it may be and theres room for other people (accomplaces) and since it was built before the time of crumple zones then it shoul easily withstand ramming other cars, going through baracades, and hitting other random things. And they are pretty much bulletproof the way they are (made of steel, unlike newer cars). They may be easily noticed but they should be strong enough, big enough, and maybe even fast enough to help you get the 'goods' and people/crew away from the scene and out of danger. Theres really like any safety devices either, you may be lucky if it even has a seatbelt. Just a thought.