Towball wiring will now be inspected during your MOT.
The 7 or 13 pin socket will now be checked to ensure that it is mounted satisfactorily and that the wiring is sound. The 13 pin socket will be further checked to ensure the wires control the correct functions on the caravan.
This is clearly important to ensure that your caravan refrigerator stays cool during your journey such that you can enjoy a cold beer when you arrive. Wiring that is visible and poorly supported could affect the operation of the caravan refrigerator and could easily cause a short circuit.
Take a few minutes on a regular basis to check your towing sockets to ensure they have not been damaged in any way.