When not specified or set to 0 then no restriction is applied. Prefab model unit prefab_model (found in "/def/world/prefab.sii") got new attribute allowed_trailer_length defining maximum length of trailer or trailer chain that can be spawned or delivered to the company prefab (value has to be integer in range and presents length in meters). Physics data definition ( "/def/vehicle/physics.sii") got newly specified roll and pitch for trailer and spreader joints: trailer_joint_pitch, trailer_joint_roll, spreader_joint_pitch and spreader_joint_roll. Hard parking is by default disabled and can be enabled in game by using command " g_simple_parking_doubles 0". Multi pivot trailers got separated experience bonuses attributes: exp_park_double_bonus, exp_park_double_bonus_medium and exp_park_double_bonus_hard.
Otherwise you might have to use the batch renaming functionality (see Batch renaming) to fix the conflicts when new patch appears. road_look.sii) it is HIGHLY RECOMMENDED to use suffix or prefix in the name to avoid conflicts with new objects we are adding in patches.