28.11.2015, 11:29
It IS what you are looking for.... There is no any callbacks for it so you need to do what you told not to do...
Create a timer and loop through all players, Check if there is a trailer attached to their car, if yes, get it and set its lights.
Create a timer and loop through all players, Check if there is a trailer attached to their car, if yes, get it and set its lights.