I use Hacker/Hacker Pro. This way you can see claymores/motion sensors and you know you got a camper near it.Use some Flashs and thats one more down. I also use motion sensors before entering a room etc.
Dont forget to bring Hardline. Also if you got Hardline Pro you could just try changing a care packages' content and if you're lucky you might get attack dogs like I did
or something else.