A trailer should always have a positive nose load. The jockey wheel provides support for this load when the trailer is uncoupled to the vehicle or security post.
The jockey wheel helps with the manoeuvring of the trailer and having a telescopic jockey will save your back while uncoupling. Sliding types are only suitable for the light trailers where the coupling can be easily lifted off the ball by hand.
Anti-vibration is designed to prevent the jockey slipping within the clamp whilst under heavy loads or when retracted for transit.
Prop stands help to maintain the integrity of the trailer chassis by supporting it during loading and unloading and they should be used even if the trailer is still coupled to a vehicle. Payloads are not evenly distributed when loading occurs. When complete, loads should always be evenly distributed around the trailer to avoid snaking and pitching during transportation. Swivel-foot prop stands are also available and these have the advantage over fixed-foot by finding a level on uneven ground.