Random number generation - In equal distribution of variables

I need to generate random numbers with equal number of variables, For example

Variables[A,B,C] (A = 1, B = 2, C = 3)
Between [1,12]

Trial 1: 1 3 2 1 3 3 1 3 2 1 2 3

Trial 2: 3 3 1 1 2 3 1 2 1 1 2 2

In both trials variables were not equally distributed. For each trail I need 4 A's, 4 B's, 4 C's in equal distribution but in random.