Glad you brought that up Brian,

If you are new to the hobby, Ask the instructor what he flys.
Many instructors bring only their trainers to the field on the weekends.

A good instructor will devote all of his time to instructing new people on the weekends or helping others and since there is no time to fly his/her other models then they are left at home.

However, I do have the answer to that little catch. For the new pilot that wants to move right up to muilt engine aircraft I have
trainers in single twin and four engine models. But I don't always take them all to the field unless someone ask.
Below is a look at the C-130 trainer.
http://testfly.0catch.com/airplanes/image/c13010.jpg
The only thing a person needs to fly is a AMA card and the interest in the hobby.

Enjoy the sport.