guerrilla warfare has a funny way of making technology meaningless.
look at Vietnam. technologically speaking, that should have been a flat out slaughter...but it wasn't.
Pretty much this, When I worked in Afghanistan as a civi I got to hear alot of what went on.
The US started to use cell phone jammers to stop IEDs so the locals just started using fishing line, They'd have kids bury mines where troops usually did foot patrols, other odds and ends that never really hit the news but most of what was done was unconventional warfare not held down by any law outside of what a person will do and what a person can do.
The military is accountable by the Geneva convention, You as an individual fighter or guerrilla warrior are not.
The worse part being if there was a civil war it's next to near impossible to figure out who's your enemy and who's your friend being in the regular forces where as a nonmilitary combatant you'll have targets galore if you're smart about it.
the same way the sand people do. daisy chained ieds, and fire lots of fire. but if the air force gets involved at all our lack of access to anti aircraft weaponry would leave us all vulnerable as fuck. maybe some rudimentary homemade shape charged shoulder fired rockets. numbers is the only way we would stand a chance. unity of the people is necessary for guerrilla warfare to be practical or applicable. we need a rifle behind every blade of grass along with help from a foreign power. someone who could help regulate the attack and arm and provide logistics to the rebels. without that resistance would be fruitless.
I was going to say use the IEDs to set off their counter measures first then use a RPG or some home made device, Other options being controlled demolition of buildings and bridges... Drop a building or a bridge on a tank and it's gunna have a bad day.
As for someone mentioning setting the back of a tank on fire to get the engine to snuff out... Maybe in WW2, Modern tanks have taken it into consideration and it takes a little more than a small fire to put them out of commission... You want a tank to have a bad day? Convert a storm sewer into one huge mother of a remote detonated mine and use the heavy iron lid to attempt to "punch through" the belly of the beast or to flip it and render it unable to be used in combat.
Option B, Go to Africa. Get some Ebola samples and rotate it into the chow huts and other areas that the military will frequent.
Even cheaper alternatives are "toe tappers" small landmines made out of 12 gauge shells to take off a foot. Ect.
Al