Does matchmaker assign sides by tank type?

Does matchmaker assign sides by tank type?

For the past week or so I've been playing almost strictly StgPzIVb, a very
fun artillery to play. I played the several maps available dozens of times
and I was frequently making plans "where to hide when I play the opposite
side". Plans I never managed to realize.
Airfield - always West.
Karelia - always North
Westfield - always North
Mines - always South
Siegfried Line - always South
Widepark - always North (and I played it 20 times at the least and always
died a * premature death without a safe place to hide while enemy
artillery enjoyed safe kills from their neatly enclosed end.)
The moment I moved to Grille I started seeing the other sides of these maps.
What are the rules of assigning sides of the map in the game? Are the
sides tiered or something like that?