Physics props are inherently expensive to calculate interactions for, particularly when you use them en mass. If the server is not particularly stable, it may be liable to crash under the stress. In this case, I might be pushing it, although I have a system in place to remove excess containers if they were to miss their mark. Also these are all destructible with enough explosives thrown at them. The idea here is stall a rush or push for few precious moments while you attempt to gather your defenses. Alternatively you could lure their forces into the mess and hopefully kill off a few tanks or even trap them into their own base temporarily if you so desired.
How many of these "events" are there? I'd expect at least two. Maybe four? And are they all triggerable by both teams?
All I know is that I had prop_physics in the race part of winterminigames and it worked fine when playing on my own local server but it crashed when it ran on viper after a jeep hit it. You can test this yourself if you make a .cfg in cfg/maps called emp_money.cfg and add sv_lan 0 in it, and invite some folks.
Note that listen servers operate differently from dedicated servers. I'd talk to Vicki and get it on one of Viper's other servers for your testing, like the pug server or something. I don't know exactly what's different between listen servers and dedicated servers, but something is different.
