As mentioned earlier, I planned to build an improved version of the Off-Road Robot 1.0. I finally finished modifing the first version and the end product was Off-Road Robot 2.0. The RCX is firmly planted to the frame, which is an improvment. I also took out the two middle wheels and replaced the front and back wheels with larger ones.
I also reversed the robot so that the back of Off-Road Robot 1.0 is now the front of Off-Road Robot 2.0. The RCX is placed toward the front to provide more traction for the front wheels, which improves the robot's off-road capabillities.