There are usually three trailers per card, including exactly one sitting 'on'/'in front'/'behind' the task bar (model appears larger), one dance (model appears smaller) and one pole dance (again, model appears smaller).
As with all good rules there are (a very few) exceptions.
Some only have two, mentioned above, there are also a few others that do not match the 1:1:1 rule above, for example Susie Q with two pole dances.
Any of the shows might have entry/exit or be done with props. No obvious pattern here. Mixed.