I built  set #8258 Crane Truck and decided it needs a companion:

A semitrailer; so I built one and I present it in this pictures.

The semitrailer dump facility is powered by two regular motors

The power for the motors is provided by an RCX brick mounted

on the crane truck.

A short film showing the semi in action can be watched on youtube:

http://www.youtube.com/watch?v=nlhGRiCcy8U

e-mail welcomed: ddaa_d@yahoo.com