If one were a betting man, then betting against the United States in war would be a lousy way to play it. There is no doubt that the stakes are very high for the defending nation and any mistake or failure to understand the opposing force and their ability to be "all knowing" in the modern battlespace bubble will result in severe losses and perhaps the most important defense barriers.
One new technology which will change and tilt the scale of favor slightly towards the defending nation are the new materials such as carbon composites and vehicles made out of predominantly nano-tube structure. Some current sensors on strike aircraft might have trouble finding them, however generally the targets, their locations and type are already pre-known prior to the striking aircraft's mission.
The goal in the first series of strikes is to eliminate Surface-to-Air threats and the US Navy and US Air Force are extremely proficient at this. Older hardware such as tanks, mobile missile launchers and vehicles made of steal really will not be able to maintain their concealment in today's battlefield.
Other strategies will also be considered by the defending nation; "If" the military mobile defense systems are made of hard to see materials and well hidden from view and will be to turn off all electronic and allow the engines to cool completely they will render little if any heat signature. Is it therefore possible for them to remain hidden?
Yes and No, if something sits too long it will show up as an anomaly on the Spy Satellite and if it moves too often it will have a heat signature and perhaps a CO2 plume which also shows up under various spectrums of light. What if the vehicles were electric?
Indeed, this makes sense too, but electric motors also get hot and take a little while to cool as well and they will need to power up a motor of some type at sometime to re-charge. Even if they were solar powered, they would still require large solar panels thus giving away their position.
This does somewhat remind us of the saying; "No where to run, no where to hide!" Of course this is the goal of the opposing strike force. When a defending nation is in such a position, it makes their political will and demands somewhat fruitless, as if push comes to shove and political impasse rears its head then there is always hell to pay.