The setTowParent command is very useful, but it lacks a companion getter.

Proposal

getTowParent _vehicle

This could be used on any vehicle and would return an array, if the vehicle was currently at either end of a setTowParent command:

[_towedVehicle, _parentVehicle]

or an empty array if the vehicle is neither the towed vehicle nor the parent vehicle.

This command would make it more convenient to match vehicles to their intended tow counterparts, or to check if a vehicle is currently subject to control by another vehicle.