Bounding box for a moving vehicle

[pnambiar]

Sorry. This is a very basic question. I am new to Arma scripting and I'm trying to get a bounding box around a moving vehicle (named pickup_truck). How do I run this script?
http://www.armaholic.com/page.php?id=30924
say for eg: [pickup_truck] execVM "bb_object_1.sqf";
I was able to get this script ( http://killzonekid.com/arma-3-bounding-box-utility/ ) but the bounding box does not move along with the vehicle!