Yes, that's exactly the scenes where "technicals" is shouted out. Nonetheless, I don't see the association between"technicals" with the gun-mounted trucks. Thanks, MIster Micawber. Armstrong
The term technical describing such a vehicle appears to have originated in Somalia. It is thought to derive from use by the Red Cross there who were often forced to bribe local militias to avoid being attacked and robbed. The money used for such bribe would be budgeted as a "technical expense" to hide its true nature. Technicals have also been referred to as battlewagons, gunw