Tamiya 56505 Motorized Support Legs
Using these support legs you can attach and detach your truck or tractor from its trailer using R/C commands.
Kit comes with motor for support leg motion, aluminium pinion parts, pre-wider microswitch and diecast rack all included.
To use this kit a 4 channel R/C equipment, a servo for the coupler and 3 R6/AA/UM3 batteries will be required but they are not included.