You can either do the job "Smuggle Across the Border" under the enforcer level on Mafia Wars jobs or you can win it as loot in fights against other mafias.
BJ
You can get the armored TRUCK on the .......Enforcer - Smuggle Thai Gems
Smuggle thai gems in the enforcer tier of new york
It is looted from the smuggle thai gems job in the enforcer tier of new york
Smuggle Thai Gems in the Enforcer (level 13-17) job tier
(20.09.09) Smuggle Across the Border under ENFORCER job tab to get amoured truck
do the job Storm The Presidential Palace
armored briefcase is looted from the Map out an escape route in the Brigadir job tier in Moscow.
A person can get a multi-purpose truck on Mafia Wars by completing the Break Into the Armory job. The truck was only available in August of 2009.
You get an Armored Limo.
You can get the Armored State Car by completing the "Storm The Presidential Palace" job which is a job in Cuba.
Actually "The armored car" is in New York..Under the Hitman tier... "Invade Tong-controlled Neighborhood"