Off road capability in it's Missile Launch Vehicles? Does Iran really need it?

Are you talking about off-road Shahab launchers? I don't think Iran needs them. Aren't the launch sites pre-selected and the missile loaded with flight programming based on it's launch location? In that case a dirt road will do. I doubt these missiles are requried to launch from any random location; maybe the extra complexity and redced accuracy would be worth it if these missiles had nuke warheads. I would bet the flight trajectory is pre-programmed in to these missiles based on launch site location and other factors and these locations at least have dirt road access.

From satellites and survalence aircraft it's harder to detect a mobile launcher traveling on a highway than it is to detect a it in motion where nothing else is moving. The best place to hide a Shahab missile launcher is near cargo trucks of similar size.