If they are in the same theatre and the shows are far and in between, yes, you can do them. Remember that the trailer check is only for the number of different prints for each feature. It is not for each screen showing. Ask the manager how many prints they are showing. Trailers usually appear around 15 minutes before the actual movie. So if you have to go to the next one, be sure you are organized so you can time them.
The print types are very easy. Is it IMAX, digital, 3D? IMAX is easy to tell and they have different glasses. It is not 3D. If the theatre has one large print like AVX, and there is another screen showing the movie, then you have another trailer to check. If it is a 3D show, wait and see when they ask you to use the glasses while showing the trailer. Most often than not, the feature could be 3D but the trailers are not. If in doubt, once the images are hazy and blurred without 3D glasses, it's on 3D. Ask the attendant for glasses.
They cannot be large format if the movie theatre does not have that format, so normally they are digital. The forms will tell you what type of large format the movie theatre has.
As soon as you give your Authorization Letter, ask for a copy of the screening schedule. Tell them you are doing the trailers and must follow the scheduling. Then it will be easier for you to organize your viewing. Always sit where you can leave immediately to go to another auditorium. Be very observant of the trailers as they could ask you if that was the correct version. If not, then you are obliged to explain what you saw. It is best to remember the first and last part of the trailer.
Audience reaction is either Positive(P), No reaction(P), Negative (N). It is easy to gauge when there is a crowd or there are more young people. If the movie has less than 20 or the movie theatre is located in the upper scale area, don't expect to hear much. Unless someone says something negative, the reaction is P. If they are really quiet, then NR.
Don't forget to have your forms filled out and signed. Be sure you can read the printout of the manager's name because you will need that in your report. Online reporting is so fast. Then you are all done.
What I would suggest is organize some shops around the area if there is a gap in timing. That way you could really make use of your time. Good luck!