The Black Jack Jockey Block is the ultimate Jack Block for your Caravan or Trailer. It will save you up to 40 cranks of the jockey wheel. So much less stress and effort when hitching and unhitching. If you use it in conjunction with the amazing Black Jack then it will save you time, and you will be more stable.
 
The Jockey block eliminates nearly all movement and sway in parked Caravans and Trailers.
It suits traditional Jockey Wheels, Black Jack trailer Jacks, Stabilizer Jacks, Wheel Jacks, Scissor Jacks, and more. 
 
Being extremely strong (rated at 6,000 kg per jockey block) and durable, it will last a lifetime. And unlike old blocks of wood it resists dirt, grime and oil so no more carrying around old smelly blocks of wood.