Let's Make Robots!

Remote Controlled combat robot

Hello everyone and thanks for the help. I would like to know what kind of motors I would need for a rc vehicle to move around 5-10 pounds at max, If you could tell me how this torque thing and rpm applies to wieght and pulling ability I would extremely appreciate it. Also it needs to be able to handle tough terrains- mud, hills, debri, etc. - An outdoor fighter.

It will have a paintball or airsoft gun mounted on it and that i am thinking will be moved up and down by a servo and shot (the trigger pulled) by a servo also.