i have yet to have my 4runner broken into. i have had other vehicles broken into, but not this one. i think the key here is to keep things out of the prying eyes. DO NOT LEAVE THINGS IN PLAN SIGHT. thieves like opportunities, they like easy targets, and they like sure things. they dont like taking any more risk than necessary, and if they are unsure of the reward for their risk they are even less likely to take the risk -basically if they cant see it, to them its not there.
i have a couple of things i do with my 4runner to keep it safe.
1, i almost never leave things out in the open to be seen other then the car seats.
2, i have tented windows that makes seeing in much harder if i ever do accidently forget something inside.
3, if i must leave something in my runner of value, i always put it in the rear, and use the cargo cover to cover it.
4, i always try to find a well lit, and well traveled area to park it, and do not leave it in sketchy areas unless i am within view.
5, i have an alarm with a blinking led light -i moved that light to the top of the steering column cover to be very obvious to anyone looking in.
6, if all that fails i have lojack. -now lojack will only be useful if they take the truck as a whole, but its better than nothing.