skunk scent cat piss. dump some tar or oil where they like to stand, the owner of the rover will piss himself after he finds some of the grease in his ride. adding lights will work put the lights where they are easily replaced when they knock them out. putting smelly stuff on the wall where they like to lean. right or call your councilman/mayor/chief of police/community ombudsman. Discretely take video of them and send a tape to the local tv. after many calls to 911, call local tv. Never lie to 911, but do not be afraid to strongly shade your statements. "They are holding a bunch of laptops that might be stolen, and I smell what might be meth or crack" "Please come fast, they made some nasty comments about sexual assault to my GF" "i heard them say they had a gun" not easy to prove you were lying.
the tear gas cannister would work well with a pull wire attacked to the ring. tape/wire the cannister to a garbage can, wait till they arrive and without them knowing you are home pull the pin. Also if you can get into the rover. use a soup can, place the pinless cannister inthe soup can, stretching a wire from the cannister to the rear door or from a can attacned to the seat to the front seat, let them open the door and bingo smoke attack from inside.