they may not be listed in the rules but they fall under the category V, 1, A which is, if its 99% impossible for the zombie to tag ct then its illegal..
1. 2 per tube, i strictly enforce this, based on my experience having 2 cts camping the tube using the strategy 1 shoot 1 reload, will be almost impossible for the zombie to infect, unless they all work it all out on a train(which we hardly get the zombies to) but imagine having 3 in it?
2. money crate/cade(box with a money texture) i always tell people to not use this cade for 1 reason and 1 reason only, when you're a zombie and you pressed E on it to push it actually pulls. zombie have to be on top of the cade for it to push back, but before you can even get on top of it you have already being shot at. the next thing you know half the zombies are dead and the round is over and you are not even through..
just because it is not stated in the rule doesnt mean it does not applies to it or falls under its category.. you gotta think about the advantage/disadvantage of the situation..
correct me if im wrong but thats how i see things and it always works out..