Combine the ammonia with bleach (be careful) if you want them to leave it feet first.
Half the crowd has jars of ammonia, half has jars of bleach, they mix on the ground under the RV.
A binary chemical weapon doesn’t have to be fancy...
Different bottles taped together always seemed to make sense to me.
But that is chemical warfare. I would make sure “they” don’t find out where your family is—cuz they will get a taste of the good stuff shortly thereafter.