im seem to be the only one in the OFP community that seems to be able to make convoys work 100% correctly first time, every time,
basic trick to get a smooth journey, only have the one waypoint at the convoys destination that way the vehicles will guide themselves there using the roads as much as possible.
Soft vehicles tend to nicely stay on the road most of the time
Armoured need to be in safe mode to follow roads (try not to mess with there speed), other wise they will just drive cross country