As someone who works AV in hotels, I will say that I have always found it more beneficial to advance a show with outside AV - I get to know the WX freqs they're using, what power is being used, and maybe help some cool people with items they forgot or beed supplemented.
We all need to eat, but the table is bog enough.
I say call the AV crew at the other locations and see if they can help you out with specifics for trim height, etc.
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From my POV, being the outside contractor in your hotel, I try to be the "guest on a mission." Part of that is developing a relationship with the in-house provider.
While I'm all about being fully self-contained or getting my client to pay for deck sections, I'd rather throw the in-house provider a bone for some of the stuff that I can be reasonably certain they can do. I may bring my own stuff, too, so if a problem develops I'm covered - but having the in-house provider as a part of my team makes sense.