This is an experiment done by sorgonet.com about building a walking platform who could carry things on and move on no-plain terrain.
The motors we used on this project were very powerful, (can carry a screen on) and unusuals (AC 220v). Those who want to try it at home, can use any kind of motor.
It consists on 4 motors and an aluminium self build platform firmly attached.
Every motor moves a leg with consits on  two little aluminium pieces joined together. The angle is about 135 grades.
It walks slowly because the motors, but its strong.