Here you go:
Place a trigger activated by a radio channel with the following in the 'on activation' field: [truckname] exec "carbomb.sqs"
;Carbomb Script
;_delay is the number of seconds before the bomb explodes
_truck=_this select 0
_delay=10
hint "Bomb Activated"
#delay
~1
_delay=_delay-1
?(_delay>0):goto "delay"
_tpos=getpos _truck
_tpx=_tpos select 0
_tpy=_tpos select 1
"laserguidedbomb" camcreate [_tpx,_tpy,0]
exit
Syntax not guaranteed, but it should work.
-Grendel