The Grip Jockey wheel can be adjusted to a maximum height of 600mm and a minimum of 350mm. It has a maximum load capacity of 227kg making it suitable for use with small to medium trailers. The 200mm solid rubber wheel makes manoeuvring your trailer super easy and ergonomical. Also featured in this jockey wheel the unique swing back design mounting clamp allows easy, out of the way, storage of the jockey wheel when towing.
Features:
Heavy duty steel construction with quality thread height adjustment
Heavy duty winding handle with steel turning knob
Mounting clamp can be bolted or welded to framework or drawbar
Solid rubber 200mm diameter jockey wheel (approximate size)
Silver zinc plated finish for corrosion resistance
Application:
To allow easy manipulation and manuverability of trailers, caravans and horse floats. This product also helps to maintain easy hook up by the raising and lowering of the drawbar coupling.
Specifications:
Load capacity 227kg
Minimum height 350mm
Maximum height 600mm
Mounting plate size (L x W) 147 × 200mm
Mounting bolt hole size 13mm
Distance between outer holes 170 x 100mm
Distance between inner holes 50 × 170mm
Weight (nett) 8.5kg
This looks very similar but is more expensive than this one. Your normal price looks extremely unrealistic to me.
http://www.ebay.com.au/itm/Jockey-Wheel-8-Solid-Wheel-500-lb…