When you first start out in Crime City it is easy to get carried away doing missions, gaining levels and generally plowing through the game. There will however soon come a point where you will constantly get your arse / ass handed to you in PvP because you have reached a point where you have under-developed stats be it Attack, Defense or your Mafia Size.
I found (via trawling the Interwebs and testing) that I could get an infinite supply of Armoured Trucks (Att – 2 Def – 5) for 112 Energy each.
Look, I have 104 at the time of writing and they are much better than crappy Vans (1/2), Junkers (1,1), Hudson Hornets (1,1) and other vehicles you are probably all ready using. Also remember that for each level you can use 5 mafia members (if you have them) each of which can use a vehicle, a gun, a melee weapon, an explosive and some armour.
How do I get them Ham?
The first thing you need to do is fully complete the Docks area. By fully complete I mean do every mission 5 times so that you get no more arrows. I’m not 100% sure this is necessary but J and I both have 5/5 and this technique works for us.
With this done, you need to do the 2 stage job called Steal shipment from the right hand warehouse in the Docks. It costs 112 energy in total and will yield between $300 and $900, 26 XP and a single armoured truck
I have done this 104 times so far and have never not gotten the truck. After auditing my mafia, and vehicles they were using I found that I have increased by defense by roughly 450 from getting these trucks.
I hope you find this helpful and as always feel free to add any extra help via the comments.