What can affect the driving stability of a towed trailer?

You answered correctly. The driving stability of a towed trailer can be affected by all three factors listed.

If the centre of gravity is far back in the trailer, it can make the trailer prone to swaying and instability, especially at higher speeds or during sudden maneuvers. Insufficient tyre pressure reduces grip and can cause uneven load distribution, leading to poor handling and increased risk of losing control. A leaking shock absorber affects the trailer’s suspension, making it harder to keep the wheels in contact with the road, which further reduces stability.

Knowing these risks helps you maintain your trailer properly—always load heavy items over the axle or slightly forward, check tyre pressure regularly, and ensure the suspension system, especially shock absorbers, is in good condition. This keeps the trailer stable and safer to tow.