Few days ago i finished this RC skidder. Base of this machine was on Caterpillar 525 Skidder but unfortunately I run out of plates to make it look more like real. It has five different functions but you can only use four at same time. Switchin usage of front blade to rear grapple is made by using switches. Powered functions are: Driving (no differentials), 1XL-motor Steering via worm gear, 1 M-motor Lifting grapple, linear actuator and M-motor Grapple using worm gear, 1 M-motor Front blade two small linear actuators, 1 M-motor. Skidder can run pretty good on different surfaces and has swing axle on front. The front of skidder is pretty heavy because battery box is placed there but thats why i used the smaller one.