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imo, one of the worst think we can do when playing warhammer or tabletop wargaming is not declaring our list, or stating exactly what is where.
This can lead to lots of bad situations in a friendly enviroment, let alone in a gaming store.
If you want to have secret stuff to write down, secret placement, secret equipments, etc. you need a Game Master, a Referee or a Judge. In a campaign, maybe, we could arrange some rules for "secret" deployment and such, but mostly because a campaign has some sort of referee...

 

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I play with a model balanced on the hatch to ensure that I don't give the impression that I've swapped squads.

yeah, this happens to me too

 

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So my Non-Dedicated transport thing or Fortifications thing is still not forcing you to reveal.

please don't. Rules don't specifically tell that you can't smash enemy models with a chair, but i'll never do that. A thing like what you are proposing, imo, not being covered specifically in the ruls, should ALWAYS be pre-arranged with the opponent. it could be a fine house-rule and i would abide to it, in your house, but at a gaming store? you are just trying to be "that guy" :scare:

 

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Hey Folks!

Just thought I'd chime in on the transports thing.

Just prior to the standard deployment method it mentions that units may be deployed inside buildings, fortifications or transport vehicles within their deployment zones.

It's pretty tenuous logic, but we've generally played that as the vehicle is deployed first and then the squad is deployed into it. Obvious restriction is that dedicated transports can only have their respective troops deployed into them.

As you're deploying into the field, we treat this as having to declare which transport you're deploying into.

That said, I have played games with the hidden cargo dynamic, and it never changed much in the grand scheme of things.

It's hard to put any hard and fast rules to it, but like everybody has already mentioned, I'd ask permission to play like this rather than expect it. Could always be a laugh for both sides!

Welcome on Heresy, Rush!
The "hidden cargo" rules seems funny