On the sidesteeet between the parking lots that leads to the dome theaters there may be parking for a big rig. I would google earth it.
There's free parking across from the house, I very easly parked my 2500 Ram in the lot, plenty of room early in the day for my 11 am tour
As everyone said parking a large truck and trailer would be rather difficult in that parking. Even if you got permission to take a few spots it wouldn't be a fun parking Adventure. I would definitely recommend parking elsewhere and trying to take and Uber / Lyft / Taxi
Its a normal parking lot. You would need to call ahead to confirm if it's alright to take up several spots.
I would call ahead to make parking arrangements for such vehicles.
That's unlikely I'm sure you can park like a block away that's the best bet or something like that
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